Thanks Rene. Nope, afraid not. I don't want it on top all the time, I just want it to bring itself to the top when a page is received but stay in the background until then.
I actually have CMDOW doing what I need (using C:\Program Files\cmdow.exe " PDW v3.12" /ACT) but I need to use filters to trigger it and I thought it would be nice to do this without a third-part application but rather get the PDW application to do it from within itself.