Is there a way to make a Multithreaded/Multiuse COM to multitask when used by two seperate apps at the same time?

Lets say I have App1 creating the COM object and App2 creating the same object, which was compiled Multiuse (this means only one copy in memory of the object). Can App1 start a long process inside the COM object followed by App2 starting a short process (which means App1 should finish first). Or will App1 block until it is finished?

How can this be accomplished?

Regards,

Costas