keep one window focused

Hi,

For a setup of a computer, I have my workspace spilt in two
vertically. In the left frame I have my application window. When the
application in the left frame opens a window it opens in the right
frame, and focus stays in the left frame. This is all configured with
winprops.

Now I want to be sure that the focus never leaves the left frame,
whatever the user does. Is this somehow configurable or should I write
a Lua script? In the latter case, I could use some indications about
how to do it .

Thanks in advance

Raph
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