it was easier for me to find in docs: I remember I saw it somewhere in Tk but had only Tcl/Tk handy.

In my opinion Tcl::Tk is more Tk than Tk, because first one refers to most recent and up-to-date one.

addition: as long as Tcl::Tk many compatible with Tk, and based on your post, here are two other ways which indeed work: 

perl -MTcl::Tk -we "print Tcl::Tk::tkinit->server"

[download]
or 
perl -MTcl::Tk=:perlTk -we "print tkinit->server"

[download]

In reply to Re^3: How to detect X? by Courage
in thread How to detect X? by blazar

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