Idocs?!? Outbond and Inbond Idocs??

Hi Gurus,

I've some doubts about idocs...

My client has a requirement in order to integrate Sap with other foreign system, and has adopted the solution Java Caps + Idocs. I've been reading some documents about Java Caps and idocs, and as far as i know the creation of the Idoc it's done via RFC, this is, every time that the RFC is called from the other system , do its procedure, creates and sends the idocs.

Well my doubt starts here... Is it possible to send the Idoc to other system without order from the other system? Can i create the Idoc and sent it directly to the other system without action from the other system ?

Thanks in Advance,

Regards,

João Martins