I have TCMD's Comspec (options) set to g:\tc15\tcc.exe. But TCMD does not set it's environment variable COMSPEC to match that. My COMSPEC is the default (CMD.EXE). So if I specify a button command to be "%COMSPEC ..." I get a CMD tab. TCC sets its own COMSPEC to itself. It would only seem natural that TCMD set its COMSPEC environment variable to match its option-specified COMSPEC.