I know that an ActiveX DLL is considered faster because you don't have to
marshal data across process boundaries, but what's the downside to using
them Vs an ActiveX EXE?  Does piggybacking on the client's thread have any
drawbacks?

Thanks

Here is the Scoop

DLL
    Pros - Fast
    Cons - Same Process as client (Can Spawn Threads)
                Less Robust (If DLL Bombs then the client goes down with it)

EXE
    Pros - Own Process Space (More Robust)
               Can Spawn Threads
               Provides Asynchronous Operations
    Cons - Slow

Cheers

Gregory A Jackson MCSD, MCT
Sr Software Engineer
STEP Technology
PDX, OR