Is it possible to receive IDOCs from a non-SAP system?

Hi,

I'm facing a problem where I have to configure SAP MII (12.0) to receive IDOCs from a non-SAP client. Is it possible? I'm dealing with a system named Hydra (developed by MPDV) and I'd like to know what I should configure in Hydra systems in fields like: PROGID, GWHOST, GWSERV, SYSNR, CLIENT etc.

Anyone can help me?

Thanks a lot in advance