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>> Is there any way in Guile to have special code executed whenever a >> particular variable is set? Jim> I tend to feel that such things are an attempt to make notation Jim> more "cute" than is really a good idea. If something looks like Jim> a variable assignment, it should be a variable assignment, not a Jim> function call. A programmer shouldn't be wrong if she assumes Jim> that assignments are idempotent, etc. Speaking as a long-time Tcl user: variable traces are very handy. People rarely use them to do complicated things. Typically you use them to get state changes propagated through a system. Also, they are heavily used in Tk so that variables can be used to represent visual state. I think this is a particularly nice use for this feature. Guile could use some object to represent watchable "variables" in this same way. However, for best results you'd want agreement on how this is going to be done. Tom -- tromey@cygnus.com Member, League for Programming Freedom