http://www.purl.org/tcl/home/man/tcl8.4/TclCmd/tclvars.htm collects the formal reference info for tclvars... ---- The variables tcl_wordchars and tcl_nonwordchars define what letters are treated as valid for words. The variables are auto-loaded along with the commands they control, such as [tcl_endOfWord]. This means that to change the characters that are valid, you must first do something like: catch {tcl_endOfWord} ---- ---- See also "[Tcl syntax help]" and "[magic names]". ----