 The initial 1993 Wine Windows compatibility layer was based on Tcl/Tk windowing functions MacDonald wrote (though later rewritten as direct Xlib calls).MacDonald founded BrowseX Systems in 1999, and put out version 1.0 of BrowseX, an open source Tcl-based cross-platform web browser, meant to be smaller and faster than Netscape.The last update of BrowseX was in 2003; the company was renamed to PDQ Interfaces Inc., and put out a set of various TCL based utilities.