Found something else that might answer that:
Quote:
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The initial value of tcl_library is set when an interpreter is created by searching several different directories until one is found that contains an appropriate Tcl startup script.
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Quote:
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If TCL_LIBRARY isn't set or doesn't refer to an appropriate directory, then Tcl checks several other directories based on a compiled-in default location, the location of the binary containing the application, and the current working directory.
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Makes one wonder...