>Also, check out the articles:
>
>http://msdn.microsoft.com/library/techart/mtsvfp.htm
>
>http://www.west-wind.com/presentations/mts/mts.htm
>
>http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fox7help/html/newcontrolling_call_blocking.asp

Thanks - I'm now building up a sizeable list of URLS to visit and read. ;-)

One concern I have - if I make the dll multi-threaded, what happens to object properties and variables.

Say User1 instanciates my object and myojbect.property1 is set to "123", with a variable myvariable set to "Matt".

If User2 simultaneously instanciates the object, are the properties and variables [and anything else] kept separate from each other or do the users share properties etc?

I possibly didn't explain that very well - been on the 'phone all day trying to get this to work [the client is in England and I'm in Scotland], so my head is nipping as we say here ;-)

Best.

Matt.