"TCOMM User Supported Version 1.6 is written in C and assembly language. The software was originally designed by Larry Jordan in 1983 and written by Larry Jordan and Jan van der Eijk based on several man-years of experience writing and testing unattended communications software. TCOMM was first published commercially as Version 1.15 in February 1985. Demonstration Version 1.5 and commercial version 2.0 were published in August 1985. All software modifications have been made by Jan van der Eijk since August 1985, including the changes required for Version 1.6 and the commercial versions of TCOMM and TCOMMnet."