What is better for bi-directional communicaton in COM...

callbacks or connection points?

I have read that callbacks are more efficient, then I read somewhere else that connection points are the prefered method.

My server is an out-of-process server and I don't know if that makes a difference or not.
johndixsonAsked:
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jhanceConnect With a Mentor Commented:
An out-of-process server cannot perform a callback to your process.  Callbacks can only be done from something that shares the same virtual space.  An out-of-process server is by definition, out-of-process.

So you're left with connection points...

Even if it was in-proc, using callbacks defeats the structure of COM.  So I'd suggest that connection points are the right way regardless of whether this is in-proc or out-of-proc.
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