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XSPEC and tcl/tk
Because tcl is a full scripting language, users can write complex scripts with loops, branching, etc., which utilize XSPEC commands. Here we describe how to use those features of tcl necessary to give the user similar functionality to that available in previous versions of XSPEC, and to give information on the details of our tcl implementation that may be useful to experienced tcl users. For a description of tcl, see, for example, Practical Programming in Tcl and Tk, B. Welch, (1997, Prentice Hall).
Tk, tcl's companion graphical user interface (GUI) toolkit, is also loaded by XSPEC on startup. Although XSPEC does not itself use tk, its presence allows users to write XSPEC scripts with graphical interfaces using Tk commands.