This is a simple utility for adding three terminal control sequences
to a standard Z-System TCAP (terminal capabilities descriptor) to
make an extended TCAP with enough features to run the ZMATE text
editor and the V file viewer (and possibly other programs).  XTCAP
works with the in-memory TCAP and will allow the new TCAP to be
saved to a file for later use.     Jay Sage, April 29, 1990