I would like to have one .btm script start a second one as a parallel process, rather than calling it in the current process. A.btm: start "B" "b.btm" And I want b.btm to run in another tab within the same tcmd interface (especially now that version 17 doesn't have the dialogs from different tabs block one another bug! Yay!!!). But when I execute the above code, b.btm starts in a new TCC command-window, not in a new tab within the current TCMD window. Not sure what's misconfigured? Help!