>Roxanne,
>
>In-Proc vs Out-of-proc is really only significant in terms of how things get loaded into Windows memory and what the server has available to it. In-proc (DLL) runs inside the address space of the client app. Out-of-proc (EXE) is a separate exe running on the machine with it's own address space and event queue. It doesn't really have too much bearing on exactly how you split your whole app into server and client modules. Either an EXE or a DLL would have the same amount of reuseability for you.

Oh. Ok, I think I get it now. But tell me this, how do you decide whether it is best to do something In Proc. or Out-of-Proc.? Would that decision be based on how much memory resources the client app is already using or something else?