Brings up the Screen Size dialog box where you specify the screen size to be used.  You define the screen coordinate system when the desktop is empty.  Once you have added objects to the desktop, the Screen Size option may be viewed but not modified.

Screen size only affects graphical regions, textual regions, image regions, sense regions, and keys.  Dialog regions, dialog boxes and all controls are always specified in dialog units.

Select size to specify the number of horizontal and vertical pixels on the screen.

Select device units to specify that the screen coordinate system should correspond to the resolution of the display device.

Select dialog units to express the screen coordinate system in dialog units.