packages
Options->Manage Packages->List & Install:
Right-clicking on any line and selecting help give me this backtrace:
Signaling: (void-function pui-help)
call-interactively(pui-help)
dispatch-event(#<misc-user-event (call-interactively pui-help)>)
pui-popup-context-sensitive(#<buttondown-event button3>)
call-interactively(pui-popup-context-sensitive)
XEmacs 21.1.2 and both sumo packages.