GetMHandle
GetMHandle Given a menu ID, obtain a handle to the menu
#include <Menus.h> Menu Manager
short menuID ; menu ID
returns handle leading to a MenuInfo structure
GetMHandle provides a handle needed for most menu operations. You need
this when you have read an 'MBAR' resource to install an entire menu bar via
GetNewMBar and you want to add or modify items in the menus.
menuID is the ID of a menu.
Returns: a 32-bit MenuHandle; a handle leading to the variable- length
MenuInfo structure of menu menuID.

Notes: Most Menu Manager functions require a MenuHandle parameter; e.g., to
change an item's text, add new items, and so forth. When you read an entire
menu bar resource via GetNewMBar, you must use GetMHandle to get the
required handle.