If you've booleaned a hole in a wall you can boolean a window frame in another part of the screen and then just move it to where the whole in the wall is.....the two won't affect each other. 1 create/boolean a hole in a wall 2 create/boolean window frame 3 move window frame into hole in wall. Hope this is what you are looking for....

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All the Woes of a World by Jonathan Icknield aka The Bryster

And in my final hours - I would cling rather to the tattooed hand of kindness - than the unblemished hand of hate...