auto_execok is one of several ''commands'' documented at
http://www.purl.org/tcl/home/man/tcl8.4/TclCmd/library.htm 


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Canonical example usage:
    eval exec [auto_execok dir] *.$suffix

[[Explain why this is better than $::env(COMSPEC), cmd.exe, ...]]














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See also [exec], [Invoking browsers], 


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[Tcl syntax help]
- [Arts and crafts of Tcl-Tk programming]
- [Category Command]
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