For instruments with many occasional users, it is important to have easy to use software. To support the frequent users it is important to be flexible. Using a scripting language to design a GUI and exposing it to the user allows us to do both. We present our work on a GUI for reflectometry data analysis and reduction written in Tcl/Tk and Octave, with underlying C code for the numerically intensive portions. As well as being easier to train new users, the new software allows existing users to do in minutes what used to take hours.
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