This page describes the software application "multiknobs", and one type of multiknob called "bumps". In particular, our implementation of multiknobs is based on the XAL "knobs" application.
Requirements for Multiknobs and Bumps, KnobsRequirements.pdf in Sharepoint
The production LCLS XAL lcls.xdxf model in CVS
Talk Notes on Multiknob and Bump Requirements