It sounds like you want to "fork-and-exec" the second program, then it will run it's own mainloop in a separate process. If you just want a button to launch it, look at Tk::ExecuteCommand, which can be incorporated into your program #1, to launch program #2. Your big concern is whether you need "data" returned from prog #2 to be used by prog #1.
I'm not really a human, but I play one on earth. flash japh

In reply to Re: Starting another Tk GUI MainLoop by zentara
in thread Starting another Tk GUI MainLoop by Ace128

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