I have installed a few apps using the Apps program. A few have appeared as icons on the wbar, but neither those nor other installed apps show under the IceWM>Programs menu.
I have:
xterm
Programs
Toolbar
Windows
Help
Settings
Logout
Toolbar, Windows, Settings, and Logout have sub-menus/selections, but Programs has nothing but a 1/2" long by 1/16" thick bar/menu stub.