I've used Tkinter quite extensively for various tools, but never for anything big. I believe it will work nicely for a data input type of application. I don't know if you'll experience significant "lag" when updating app-windows on old pentiums, but it shouldn't be a problem. Mind you, the machines should have a decent amount of ram (I guess around 128 mb and upwards is reasonable). The only problem I've ever encountered was with updating Tk widgets from threads in a threaded app - it won't work. The solution was nothing worse than using an output queue, and having an event check the output buffer every second or so.
The Tcl/TK crowd probably have more extensive experience with using Tk and Tix for bigger long running apps, maybe you can ask them for more info? Good luck with your app! Lars -- http://mail.python.org/mailman/listinfo/python-list
