Exhibit 24.1 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS, that each of the undersigned directors and officers of PENTON MEDIA, Inc., a Delaware corporation (the "Company"), hereby constitutes and appoints Thomas L. Kemp, Daniel J. Ramella and Preston L. Vice, and each of them, as the true and lawful attorney-in-fact or attorneys-in-fact, with full power of substitution and resubstitution, for each of the undersigned and in the name, place and stead of each of the undersigned, to sign and file with the Securities and Exchange Commission under the Securities Act of 1933 one or more registration statement(s) on Form S-4 relating to the registration of the Company's debt securities with any and all amendments, supplements and exhibits thereto, including pre-effective and post-effective amendments or supplements or any additional registration statement filed pursuant to Rule 462 promulgated under the Securities Act, with full power and authority to do and perform any and all acts and things whatsoever required, necessary or desirable to be done in the premises, hereby ratifying and approving the act of said attorneys and any of them and any such substitute. Executed as of this 26th day of June 2002. /s/ Thomas L. Kemp /s/ Peni A. Garber - ----------------------- ------------------------ ------------------------ Thomas L. Kemp Peni A. Garber Daniel J. Ramella Chief Executive Officer & Director Director Director (Principal Executive Officer) /s/ R. Douglas Greene /s/ Edward J. Schwartz - ------------------------ ------------------------ ------------------------ Preston L. Vice R. Douglas Greene Edward J. Schwartz Interim Chief Financial Officer Director Director (Principal Financial Officer) /s/ Jocelyn A. Bradford /s/ King W. Harris /s/ Hannah C. Stone - ------------------------ ------------------------ ------------------------ Jocelyn A. Bradford King W. Harris Hannah C. Stone Vice President & Controller Director Director (Principal Accounting Officer) /s/ Paul W. Brown /s/ William B. Summers - ------------------------ ------------------------ ------------------------ Paul W. Brown John J. Meehan William B. Summers Director Director Director /s/ Daniel C. Budde - ------------------------ ------------------------ Daniel C. Budde David B. Nussbaum Director Director Exhibit 24.1 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS, that each of the undersigned directors and officers of STARDUST.COM, a California corporation (the "Company"), hereby constitutes and appoints Thomas L. Kemp, Daniel J. Ramella and Preston L. Vice, and each of them, as the true and lawful attorney-in-fact or attorneys-in-fact, with full power of substitution and resubstitution, for each of the undersigned and in the name, place and stead of each of the undersigned, to sign and file with the Securities and Exchange Commission under the Securities Act of 1933 one or more registration statement(s) on Form S-4 relating to the registration of the Company's guarantee of the debt securities of Penton Media, Inc. with any and all amendments, supplements and exhibits thereto, including pre-effective and post-effective amendments or supplements or any additional registration statement filed pursuant to Rule 462 promulgated under the Securities Act, with full power and authority to do and perform any and all acts and things whatsoever required, necessary or desirable to be done in the premises, hereby ratifying and approving the act of said attorneys and any of them and any such substitute. Executed as of this 26th day of June 2002. /s/ Carl Pugh /s/ Preston L. Vice /s/ Thomas L. Kemp - ---------------------------- ------------------------------- ----------------------- Carl Pugh Preston L. Vice Thomas L. Kemp President and Director Interim Chief Financial Officer Director (Principal Executive Officer) (Principal Financial Officer) /s/ David B. Nussbaum /s/ Daniel J. Ramella - --------------------- --------------------- David B. Nussbaum Daniel J. Ramella Director Director Exhibit 24.1 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS, that each of the undersigned directors and officers of PTS DELAWARE, Inc., a Delaware corporation (the "Company"), hereby constitutes and appoints Thomas L. Kemp, Daniel J. Ramella and Preston L. Vice, and each of them, as the true and lawful attorney-in-fact or attorneys-in-fact, with full power of substitution and resubstitution, for each of the undersigned and in the name, place and stead of each of the undersigned, to sign and file with the Securities and Exchange Commission under the Securities Act of 1933 one or more registration statement(s) on Form S-4 relating to the registration of the Company's guarantee of the debt securities of Penton Media, Inc. with any and all amendments, supplements and exhibits thereto, including pre-effective and post-effective amendments or supplements or any additional registration statement filed pursuant to Rule 462 promulgated under the Securities Act, with full power and authority to do and perform any and all acts and things whatsoever required, necessary or desirable to be done in the premises, hereby ratifying and approving the act of said attorneys and any of them and any such substitute. Executed as of this 26th day of June 2002. /s/ Daniel J. Ramella /s/ Preston L. Vice - ------------------------------ ------------------------------ Daniel J. Ramella Preston L. Vice President and Director Interim Financial Officer (Principal Executive Officer) (Principal Financial Officer) Exhibit 24.1 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS, that each of the undersigned directors and officers of INTERNET WORLD MEDIA, INC., a Delaware corporation (the "Company"), hereby constitutes and appoints Thomas L. Kemp, Daniel J. Ramella and Preston L. Vice, and each of them, as the true and lawful attorney-in-fact or attorneys-in-fact, with full power of substitution and resubstitution, for each of the undersigned and in the name, place and stead of each of the undersigned, to sign and file with the Securities and Exchange Commission under the Securities Act of 1933 one or more registration statement(s) on Form S-4 relating to the registration of the Company's guarantee of the debt securities of Penton Media, Inc. with any and all amendments, supplements and exhibits thereto, including pre-effective and post-effective amendments or supplements or any additional registration statement filed pursuant to Rule 462 promulgated under the Securities Act, with full power and authority to do and perform any and all acts and things whatsoever required, necessary or desirable to be done in the premises, hereby ratifying and approving the act of said attorneys and any of them and any such substitute. Executed as of this 26th day of June 2002. /s/ Thomas L. Kemp /s/ Preston L. Vice /s/ Daniel J. Ramella - ------------------------------ ----------------------------------- -------------------------- Thomas L. Kemp Preston L. Vice Daniel J. Ramella President and Director Interim Chief Financial Director (Principal Executive Officer) Officer and Director (Principal Financial Officer) Exhibit 24.1 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS, that each of the undersigned directors and officers of STREAMING MEDIA, INC., a California corporation (the "Company"), hereby constitutes and appoints Thomas L. Kemp, Daniel J. Ramella and Preston L. Vice, and each of them, as the true and lawful attorney-in-fact or attorneys-in-fact, with full power of substitution and resubstitution, for each of the undersigned and in the name, place and stead of each of the undersigned, to sign and file with the Securities and Exchange Commission under the Securities Act of 1933 one or more registration statement(s) on Form S-4 relating to the registration of the Company's guarantee of the debt securities of Penton Media, Inc. with any and all amendments, supplements and exhibits thereto, including pre-effective and post-effective amendments or supplements or any additional registration statement filed pursuant to Rule 462 promulgated under the Securities Act, with full power and authority to do and perform any and all acts and things whatsoever required, necessary or desirable to be done in the premises, hereby ratifying and approving the act of said attorneys and any of them and any such substitute. Executed as of this 26th day of June 2002. /s/ David B. Nussbaum /s/ Preston L. Vice - ------------------------------- -------------------------------- David B. Nussbaum Preston L. Vice President and Director Interim Chief Financial Officer (Principal Executive Officer) (Principal Financial Officer) /s/ Thomas L. Kemp /s/ Daniel J. Ramella - ------------------------------- -------------------------------- Thomas L. Kemp Daniel J. Ramella Director Director Exhibit 24.1 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS, that each of the undersigned directors and officers of TECH CONFERENCES, INC., a Connecticut corporation (the "Company"), hereby constitutes and appoints Thomas L. Kemp, Daniel J. Ramella and Preston L. Vice, and each of them, as the true and lawful attorney-in-fact or attorneys-in-fact, with full power of substitution and resubstitution, for each of the undersigned and in the name, place and stead of each of the undersigned, to sign and file with the Securities and Exchange Commission under the Securities Act of 1933 one or more registration statement(s) on Form S-4 relating to the registration of the Company's guarantee of the debt securities of Penton Media, Inc. with any and all amendments, supplements and exhibits thereto, including pre-effective and post-effective amendments or supplements or any additional registration statement filed pursuant to Rule 462 promulgated under the Securities Act, with full power and authority to do and perform any and all acts and things whatsoever required, necessary or desirable to be done in the premises, hereby ratifying and approving the act of said attorneys and any of them and any such substitute. Executed as of this 26th day of June 2002. /s/ Shirley Brothers /s/ Preston L. Vice /s/ Thomas L. Kemp - ------------------------------- ------------------------------- ------------------ Shirley Brothers Preston L. Vice Thomas L. Kemp President Interim Chief Financial Officer Director (Principal Executive Officer) (Principal Financial Officer) Exhibit 24.1 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS, that each of the undersigned directors and officers of HEALTHWELL.COM, INC., a Delaware corporation (the "Company"), hereby constitutes and appoints Thomas L. Kemp, Daniel J. Ramella and Preston L. Vice, and each of them, as the true and lawful attorney-in-fact or attorneys-in-fact, with full power of substitution and resubstitution, for each of the undersigned and in the name, place and stead of each of the undersigned, to sign and file with the Securities and Exchange Commission under the Securities Act of 1933 one or more registration statement(s) on Form S-4 relating to the registration of the Company's guarantee of the debt securities of Penton Media, Inc. with any and all amendments, supplements and exhibits thereto, including pre-effective and post-effective amendments or supplements or any additional registration statement filed pursuant to Rule 462 promulgated under the Securities Act, with full power and authority to do and perform any and all acts and things whatsoever required, necessary or desirable to be done in the premises, hereby ratifying and approving the act of said attorneys and any of them and any such substitute. Executed as of this 26th day of June 2002. /s/ Darrell C. Denny /s/ Preston L. Vice /s/ Thomas L. Kemp - ----------------------------- ------------------------------- ------------------------ Darrell C. Denny Preston L. Vice Thomas L. Kemp President Interim Chief Financial Officer Director (Principal Executive Officer) (Principal Financial Officer) /s/ David B. Nussbaum /s/ Daniel J. Ramella - ------------------------------ ------------------------------- David B. Nussbaum Daniel J. Ramella Director Director Exhibit 24.1 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS, that each of the undersigned directors and officers of DONOHUE MEEHAN PUBLISHING COMPANY, an Illinois corporation (the "Company"), hereby constitutes and appoints Thomas L. Kemp, Daniel J. Ramella and Preston L. Vice, and each of them, as the true and lawful attorney-in-fact or attorneys-in-fact, with full power of substitution and resubstitution, for each of the undersigned and in the name, place and stead of each of the undersigned, to sign and file with the Securities and Exchange Commission under the Securities Act of 1933 one or more registration statement(s) on Form S-4 relating to the registration of the Company's guarantee of the debt securities of Penton Media, Inc. with any and all amendments, supplements and exhibits thereto, including pre-effective and post-effective amendments or supplements or any additional registration statement filed pursuant to Rule 462 promulgated under the Securities Act, with full power and authority to do and perform any and all acts and things whatsoever required, necessary or desirable to be done in the premises, hereby ratifying and approving the act of said attorneys and any of them and any such substitute. Executed as of this 26th day of June 2002. /s/ William C. Donohue /s/ Preston L. Vice /s/ Thomas L. Kemp - ------------------------------ ------------------------------- ----------------------- William C. Donohue Preston L. Vice Thomas L. Kemp President and Director Interim Chief Financial Officer Director (Principal Executive Officer) (Principal Financial Officer) /s/ Daniel J. Ramella /s/ John J. Meehan - ------------------------------ ------------------------------- Daniel J. Ramella John J. Meehan Director Director Exhibit 24.1 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS, that each of the undersigned directors and officers of DUKE INVESTMENTS, INC., a Colorado corporation (the "Company"), hereby constitutes and appoints Thomas L. Kemp, Daniel J. Ramella and Preston L. Vice, and each of them, as the true and lawful attorney-in-fact or attorneys-in-fact, with full power of substitution and resubstitution, for each of the undersigned and in the name, place and stead of each of the undersigned, to sign and file with the Securities and Exchange Commission under the Securities Act of 1933 one or more registration statement(s) on Form S-4 relating to the registration of the Company's guarantee of the debt securities of Penton Media, Inc. with any and all amendments, supplements and exhibits thereto, including pre-effective and post-effective amendments or supplements or any additional registration statement filed pursuant to Rule 462 promulgated under the Securities Act, with full power and authority to do and perform any and all acts and things whatsoever required, necessary or desirable to be done in the premises, hereby ratifying and approving the act of said attorneys and any of them and any such substitute. Executed as of this 26th day of June 2002. /s/ David B. Nussbaum /s/ Preston L. Vice /s/ Thomas L. Kemp - -------------------------------- ------------------------------- ----------------------- David B. Nussbaum Preston L. Vice Thomas L. Kemp President and Director Interim Chief Financial Officer Director (Principal Executive Officer) (Principal Financial Officer) /s/ Daniel J. Ramella - -------------------------------- Daniel J. Ramella Director Exhibit 24.1 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS, that each of the undersigned directors and officers of DUKE COMMUNICATIONS INTERNATIONAL, INC., a Colorado corporation (the "Company"), hereby constitutes and appoints Thomas L. Kemp, Daniel J. Ramella and Preston L. Vice, and each of them, as the true and lawful attorney-in-fact or attorneys-in-fact, with full power of substitution and resubstitution, for each of the undersigned and in the name, place and stead of each of the undersigned, to sign and file with the Securities and Exchange Commission under the Securities Act of 1933 one or more registration statement(s) on Form S-4 relating to the registration of the Company's guarantee of the debt securities of Penton Media, Inc. with any and all amendments, supplements and exhibits thereto, including pre-effective and post-effective amendments or supplements or any additional registration statement filed pursuant to Rule 462 promulgated under the Securities Act, with full power and authority to do and perform any and all acts and things whatsoever required, necessary or desirable to be done in the premises, hereby ratifying and approving the act of said attorneys and any of them and any such substitute. Executed as of this 26th day of June 2002. /s/ Mark Smith /s/ Preston L. Vice /s/ Thomas L. Kemp - ----------------------------- ------------------------------- ----------------------- Mark Smith Preston L. Vice Thomas L. Kemp President Interim Chief Financial Officer Director (Principal Executive Officer) (Principal Financial Officer) /s/ Daniel J. Ramella /s/ David B. Nussbaum - ------------------------------ ------------------------------- Daniel J. Ramella David B. Nussbaum Director Director Exhibit 24.1 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS, that each of the undersigned directors and officers of ONE, INC., a Colorado corporation (the "Company"), hereby constitutes and appoints Thomas L. Kemp, Daniel J. Ramella and Preston L. Vice, and each of them, as the true and lawful attorney-in-fact or attorneys-in-fact, with full power of substitution and resubstitution, for each of the undersigned and in the name, place and stead of each of the undersigned, to sign and file with the Securities and Exchange Commission under the Securities Act of 1933 one or more registration statement(s) on Form S-4 relating to the registration of the Company's guarantee of the debt securities of Penton Media, Inc. with any and all amendments, supplements and exhibits thereto, including pre-effective and post-effective amendments or supplements or any additional registration statement filed pursuant to Rule 462 promulgated under the Securities Act, with full power and authority to do and perform any and all acts and things whatsoever required, necessary or desirable to be done in the premises, hereby ratifying and approving the act of said attorneys and any of them and any such substitute. Executed as of this 26th day of June 2002. /s/ Thomas L. Kemp /s/ Preston L. Vice /s/ Daniel J. Ramella - ------------------------------ ---------------------------------- --------------------- Thomas L. Kemp Preston L. Vice Daniel J. Ramella President and Director Interim Chief Financial Officer and Director (Principal Executive Officer) Director (Principal Financial Officer) Exhibit 24.1 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS, that each of the undersigned directors and officers of BOARDWATCH, INCORPORATED, a Colorado corporation (the "Company"), hereby constitutes and appoints Thomas L. Kemp, Daniel J. Ramella and Preston L. Vice, and each of them, as the true and lawful attorney-in-fact or attorneys-in-fact, with full power of substitution and resubstitution, for each of the undersigned and in the name, place and stead of each of the undersigned, to sign and file with the Securities and Exchange Commission under the Securities Act of 1933 one or more registration statement(s) on Form S-4 relating to the registration of the Company's guarantee of the debt securities of Penton Media, Inc. with any and all amendments, supplements and exhibits thereto, including pre-effective and post-effective amendments or supplements or any additional registration statement filed pursuant to Rule 462 promulgated under the Securities Act, with full power and authority to do and perform any and all acts and things whatsoever required, necessary or desirable to be done in the premises, hereby ratifying and approving the act of said attorneys and any of them and any such substitute. Executed as of this 26th day of June 2002. /s/ Thomas L. Kemp /s/ Preston L. Vice /s/ Daniel J. Ramella - ------------------------------ ----------------------------------- --------------------- Thomas L. Kemp Preston L. Vice Daniel J. Ramella President and Director Interim Chief Financial Officer and Director (Principal Executive Officer) Director (Principal Financial Officer) Exhibit 24.1 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS, that each of the undersigned directors and officers of PENTON INTERNET, INC., a Delaware corporation (the "Company"), hereby constitutes and appoints Thomas L. Kemp, Daniel J. Ramella and Preston L. Vice, and each of them, as the true and lawful attorney-in-fact or attorneys-in-fact, with full power of substitution and resubstitution, for each of the undersigned and in the name, place and stead of each of the undersigned, to sign and file with the Securities and Exchange Commission under the Securities Act of 1933 one or more registration statement(s) on Form S-4 relating to the registration of the Company's guarantee of the debt securities of Penton Media, Inc. with any and all amendments, supplements and exhibits thereto, including pre-effective and post-effective amendments or supplements or any additional registration statement filed pursuant to Rule 462 promulgated under the Securities Act, with full power and authority to do and perform any and all acts and things whatsoever required, necessary or desirable to be done in the premises, hereby ratifying and approving the act of said attorneys and any of them and any such substitute. Executed as of this 26th day of June 2002. /s/ Thomas L. Kemp /s/ Preston L. Vice /s/ Daniel J. Ramella - ------------------------------ ------------------------------- --------------------- Thomas L. Kemp Preston L. Vice Daniel J. Ramella President & Director Interim Chief Financial Officer Director (Principal Executive Officer) (Principal Financial Officer)