Remote Automation

I still have a problem witch remote automation.
My program run on one machine with automation but when install it at two maschines it don't work.
the remote automation manager runs and the registry entry are made with racmgr32,exe.
I don't use createdispatch because i want a singleton application.
So I call attachdispatch it works with one maschine but not with remote automation.
Can anybody tell me why and how i have to to initialize automation.
Please send peace of code or tips.