The first parameter, menuItems, is an item list, with each item being a menu choice. The number of menu items is limited only by available memory.
The second parameter, checkedItem, will place a check mark next to the indicated item. The menu is position so the checked item is under the mouse. If checkedItem is omitted or empty then no check mark is made.
The last two parameters are global coordinates used to position the menu on the screen. If omitted then the current position of the mouse is used.
All parameters are optional.
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The menuItems parameter is not restricted to just an item list; Commas, semicolons, carriage returns, linefeeds, and tabs can all be used to separate menu items.
A Menu item must have at least one character and no more than 255.
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If you use PopUpMenu without any parameters then version and copyright information is returned.