Internal data structures

• int returnCode - the return code of this item.
• char *textCmd - the text command string associated with this item. When this menu item is selected by the user, the Mouse object will get this string and request it to be executed as if it had been typed at the console.
• char *itemName - the name of the item, as it should appear in the menu.
• PopupMenu *subMenu - if this is a submenu item, this is the pointer to the submenu. Otherwise, this is NULL.
• int showItem - whether or not the item should be displayed.
• int showCheck - whether or not a check box should be shown with the item.
• int checkItem - whether or not a check mark should be shown with the item.