TITLEPROMPT in permanently in the /S(ystem) environment. Below, in TCC, TITLEPROMPT is set correctly. I start PowerPro. In PowerPro's environment, TITLEPROMPT has been expanded. It doesn't happen when I start another version of TCC. But, then again, only TCC knows how to expand the variables in TITLEPROMPT. I have no idea what's going on.
v:\> set titleprompt %[_4VER].%[_BUILD]$s$s[%_PID]$s$s$p v:\> start l:\PowerPro\powerpro.exe v:\> echo %@pset[%@pid[powerpro.exe],titleprompt] 21.01.52$s$s$s$s$p