support the notions of monitor geometry (which includes "system" areas such as the Mac OS X menu bar and the Microsoft Windows task bar) and internal geometry (which excludes the system areas).
Note that code which relies on the position of a window should not assume that a window is located where it has just been programmatically displayed, but should query the current position by
. This is because the geometry includes system areas where CAPI windows cannot be displayed.
CAPI User Guide (Unix version) - 30 Aug 2011