Tcl/Tk in a Nutshell

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Special Variables

itcl::library: Name of directory containing library of [incr Tcl] scripts; can be set using ITCL_LIBRARY environment variable
itcl::patchLevel: Current patch level of [incr Tcl]
itcl::purist: When 0, enables backward-compatibility mode for Tk widget access
itcl::version: Current revision level of [incr Tcl]

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