The XFER.INC file included here is a sample implementation of Xmodem, CRC Xmodem and WXmodem which I have used to test WXmodem on the People/Link system. The source code is in Turbo Pascal. I've provided here the structured code for a single implementation of all three protocols, but not the support code (e.g. comm routines). It is provided for people who have already implemented their own communications software and would like to examine a different way to implement Xmodem. The code should easily translate to assembler, or "C". Use this code anyway that you wish, but remember that YOU use it 100% at your own risk. Peter Boswell