Everything is a string.

[unknown]

[trace]

[send]

introspection

event-based programming

simplicity

slave [interp]reters

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Also see "[idiom]", "[What is the advantage of Tcl over Perl]", "[Beginning Tcl]", "[Tcl warts]", "[Arts and Crafts of Tcl-Tk Programming]", "[Is white space significant in Tcl]", "[Tcl Heritage]", "[What is Tcl]", "[Tcl and other languages]", [Is Tcl different!]...