Menu selections are handled by the ACCEPT statement. Generally speaking, a menu selection acts much like a function key. Each menu item causes an ACCEPT statement to terminate, returning an exception value equal to the item's ID.
For example, suppose the menu has this definition:
menu main-menu "&File", 0, submenu "&New", 101 "&Open", 102 "&Save", 103 "Save &As...", 104 separator "E&xit", 105 end-menu "&Options", 0, submenu "&Save Settings on Exit", 201, checked "&Password Protect", 202, checked "&Confirm Deletions", 203 end-menu
If the user selected the New menu item, any executing ACCEPT statement would terminate with an exception status of 101.