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Joined: Jul 2007
http://www.hpcalc.org/details.php?id=3258
That program will allow easy creation of inform boxes (source code needing to be compiled) on the unit itself.
To actually do the compiling, you will need to learn a lot more regarding sysRPL. The "bible" for that is here: http://www.hpcalc.org/details.php?id=5144
Chapter 35 is all about input forms.
Honestly though, if you are just starting with userRPL, I'd rethink your interface a bit to work with the tools presented there. Once you have it working, you can move into sysRPL and make more advanced interfaces if desired.
TW