[Tcl] has been a testbed for safe interpretation since before [Java] existed (at least under that name). As [security] becomes ever more important, perhaps attention will return to Tcl just for this feature. Recognize, first, its uniqueness. Nominally peer languages--[Perl], [PHP], [Python], [Ruby], and others--have security features, but none of them really boast the power and flexibility of [interp]s [[explain]]. ...