Funkyd00d & Boreas: Yeah, I know of those, but the point is that even with those I have no information about the size of a window, and I'm moving or resizing it blind. Something that I don't want to do with for example Winamp and terminal windows (which I've comfortambly concluded to be nice at 80x34). This was the actual problem.

But it seems that tnl has the solution. RabidVWM indeed did seem to have some sort of exported variables for this.

I'll get to work. When I finish, I'll post the results in the Code -section.