asynchronous and synchronous call between apartments

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Hello everyone,


Once I thought all calls across COM apartments (not inside apartment) are
all synchronous call, now after study re-entrancy problem, I think I am
wrong, at least STA to MTA call is asynchronous.

(Link to re-entrancy problem,
http://www.codeproject.com/KB/COM/sta_issues.aspx)

After some study, I can not find a conclusion whether the 4 types of calls
are synchronous or asynchronous. Here is my study result, please feel free to
correct me if I am wrong?

1. STA --> STA, I think asynchronous;
2. STA --> MTA, I think asynchronous;
3. MTA --> STA, I think synchronous;
4. MTA --> MTA, I think synchronous.


thanks in advance,
George
.

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