Returns the width, in points, of the desktop space.
Data type returned
FileMaker Pro 7.0
In Windows, the desktop space is the space inside the MDI window (sometimes referred to as the client area).
In OS X, the desktop space is the area on the monitor in which the active window is located excluding menu bars.
In FileMaker WebDirect, the desktop space is the area on the main monitor. In OS X, the main monitor is where the menu bar is located. In Windows, the main monitor is where the taskbar is located.
Returns 450 in Windows when there is a single monitor and its MDI is set to 500 x 450.
Returns 600 in OS X when there is a single monitor and its resolution is set to 800 x 600.