Intercepting DLL, ActiveX, COM calls

Hi,

does anybody know a way to see which applications are CURRENTLY using which dll-files? And if it is is possible, is it also possible to see what functions it calls and all input and output it sends.

I would appreciate this a lot, I've been longing for something like this since a long time. But I haven't found anything yet.

Well I do know there are tools to see the names of the visual components. But I have not found a way yet to see more than just that.

All relevant help is appreciated
Thank you