Thus, PC gamers can now play Demon’s Souls online. This server code, along with the hefty amount of improvements made to RPCS3 enables users to play in multiplayer and co-op modes in games that don’t require a custom server in addition to PSN, or already have one. What this means is that you won’t be able to play with your PS3 friends via the official PSN network.
So basically, we’re talking about an emulated PSN network, and not the real PSN network. According to the team, this is a free and open source private server that can act as PSN. Going into more details, GalCiv has been working on a private PSN server replacement called RPCN.
Yeap, you read that right you can now play some of the PS3 games online via RPCS3. The RPCS3 team has announced that the best Playstation 3 emulator, RPCS3, now supports online play via PSN emulation.