Yeah, inquiring minds want to know. Looks like a C64 emulator running on a powerful PC or something. I saw a pointer though that looked like an Amiga style pointer...
It's Wings OS for commodore64. Multitasking 16 bit OS with irc client, tcp/ip stack, video player, music player, browser, image viewers, etc, etc. Requires both scpu expansion and something like Ramlink and IDE64 (essentially c64 upgraded with faster cpu, more ram and ide interface(ergo hdd/cdrom)). It's my most wanted retro toy in the world, have wanted to play with Wings for years, but unfortunately the hardware isnt common and not cheap either. Very cool stuff though :-)