Let me sum up the facts:

- There is no implementor of #hostWindowExtent: in the Trunk.
- DisplayScreen >> #depth:width:height:fullscreen: uses primitive 92, which
is not properly supported on all platforms but seems to work under Windows.
- There is a DisplayHostWindow and some HostWindowProxy subclasses in
'Graphics-External-Ffenestri', which seem to provide that feature I am
looking for.

I guess, Bert, you referred to that last point. Yes, this is in the Trunk.
:) Now, I have to find out more about this concept of host windows in
Squeak, which I did not know about.

The following code, as proposed by Tim, works fine for me:

HostWindowProxy new primitiveWindowSize: 1 x: 800 y: 600.

Although, I find this API kind of inconvenient, remembering that my starting
point was to change the #extent of ActiveWorld programmatically. ;)

Thank you!

Best,
Marcel



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