Hi Calvin,

>but I want to understand it now because I do think that it can have a big impact on performance when classes are used in a major way. Is it possible that Microsoft would release this information for us.

I don't think that Microsoft ever would release any internal information except when being forced to do so in a trial. And I actually don't believe that how classes are saved in memory does really have such a huge impact. There are much more time consuming activities that are caused by Window itself, especially when you look at the COM technology.

Christof