The ProTcXl interface is stored in the module tk. It can be linked statically into ECLiPSe during the ECLiPSe installation procedure, or it can be loaded dynamically. In either case, the code is loaded by calling
:- use_module(library(tk)).or shorter
:- lib(tk).
After loading the interface, is it possible to start a Tcl interpreter and execute Tcl/Tk commands.