winfo server: 
E:\sh>perl -MTcl::Tk -we "print map {qq/[$_]/} Tcl::Tk::tkinit->interp
+->winfo('server','.')"
[Windows][5.0][2195][Win32]

[download]

On X system there will be obvious difference.

I know that similar call exists in Tk, but can't remember right now, as it is easier done in Tcl::Tk.

In reply to Re: How to detect X? by Courage
in thread How to detect X? by blazar

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