Fab4 jive App Notes
From SqueezeboxWiki
Overview
Like the Controller, Fab4 runs /usr/bin/jive which is the primary UI application for the device.
The associated Lua scripts that accompany /usr/bin/jive are located under /usr/share/jive/
You can modify Lua scripts on the fly on the device. For most Applets, you can modify them and re-enter the Applet in the UI without restarting jive, since many applets are unloaded and reloaded when you exit and re-enter them. For other situations where your changes aren't seen in the running app, you will need to restart /usr/bin/jive for your Lua changes to be picked up.
Restarting /usr/bin/jive
See the public wiki page