http://wiki.tcl.tk/9846
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Keith Vetter 2003-09-10: Today I wanted to print a simple text from within tcl. I thought it should be easy--it is just exec notepad /p myfile.txt. But to do it properly turned out to be quite difficult.

I'll explain why, but the ultimate command you need to executes is this:

   exec c:/winnt/system32/cmd.exe /c start /min c:/winnt/system32/notepad /p myfile.txt

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