Screen real estate

[Graham Samuel]

Dear List

I have an app which needs to fill the available space in one of three 
screen sizes (VGA, SVGA, 1024 x 768). I have a kind of home-built 
Geometry Manager to do this, which works pretty well - but I don't 
want my window to bump into the pre-existing standard screen real 
estate. Examples are: menu bar and possibly Control Strip on Mac, 
Menu Bar and Dock (if permanently visible) on OSX, the thing at the 
bottom of the screen resembling the dock in Windows - sorry, forgot 
its real name. These various items use up different amounts of the 
screen, and in some cases can be there or not there or perhaps be 
relocated for example from the bottom of the screen to the side.

So my question is, is there any way to check what other windows are 
occupying what space on the screen at launch time for my app? If 
there is a solution, is it general or do I have to make it 
platform-specific?

TIA

Graham
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          Graham Samuel / The Living Fossil Co. / UK & France