A menu that can be accessed by pressing the right (menu) mouse button. The menu that is displayed is context-sensitive - its content depends on the location of the mouse pointer and the menu specification. You can specify the menu in the Pop-up Menu property under Help.
A menu that can be displayed on the screen at any time by pressing the appropriate key, usually displayed over material already on the screen. Once you have made a choice from the menu, it disappears and the original screen is restored
A menu that provides no visual cue to its presence, but simply pops up when a user performs a particular action. Pop -up menus are associated with a particular area of the workspace, such as the client area of an application, and a user must memorize where these areas are.