Application sharing with OCS R2

Hello, 

I need add a series of functionalities to an application, such as IM, Application sharing, etc. I would like to do it through OCS. Myu biggest problem until now is Application Sharing. I've read many different versions, some even say that there is no client API that allows the implementation of such funcitonalities. 

Questions: 

. Is it possible ? 

. If yes, how can I do it? What SDK should I use ? And if possible, are there any samples I can download ? :$

thanks in advanced, 

Pena