GliderMike:
... I cannot find a copy of the documentation. Can someone point me to it please.
Documentation you are looking for is included in the library .cpp and .h files. The web site had a nicely formatted version of the same.
I am looking to disable the background interrupt driven task when the menu is being used.
I think there is a function "shown()" in the OMMenuMgr.cpp that returns true if menu is displayed. If you modify the included example you can try to check the status of "Menu.shown()".