Tcl::Tk is an alternative binding to Tcl/Tk from Perl (as opposed to Perl/Tk). It uses Tcl in the bridge. It has advantages over the traditional Perl/Tk in using less memory and being faster, as well as being more portable and flexible (for example, for use on Windows/CE). It gains this by linking directly against Tcl using a bridge that has deep understanding of Tcl_Objs and PerlSVs. It has a slightly varied interface, but there is a rough Perl/Tk compatability layer (about 80% compatability). Concrete examples of advantages of Tcl::Tk module will be added into separate topics.