EXHIBIT 15.1 LETTER OF INDEPENDENT PUBLIC ACCOUNTANTS To the Shareholders and Board of Directors of ChatCom, Inc.: We acknowledge the use of our independent accountants' review report incorporated herein by reference, as filed as an Exhibit to ChatCom, Inc.'s Quarterly Report on Form 10-QSB for the quarter ended December 31, 1997, as amended by Amendment No. 1 to Form 10-QSB filed with the Securities and Exchange Commission on April 9, 1998. /s/ Grobstein, Horwath & Company LLP GROBSTEIN, HORWATH & COMPANY LLP Sherman Oaks, California April 20, 1998