Looking for information on HP 39G SysRPL input forms

[f16falcona46]

I got an HP 39gs off of eBay and I'm trying sysRPL for the first time. In retrospect, maybe not the best idea, but I think the hordes of $20 surplus HP 39gs's deserve something after all these years.

I'm looking for information on InpFormVEntry, InpFormVExit, InpFormViewUI at the moment. For example, I figured how to actually set up the input fields on the form (it's basically the same as DoInputForm on the HP 48G, apparently) but I don't know how to get the results out or customize the menu.

In fact, I really don't have much information on a lot of HP 39G sysRPL commands (e.g., KeyFace), especially how they interact with the Aplet system. Any help would be greatly appreciated!