Emulators with a rotate option

[Felsir]

My arcade is a cocktail type; with a widescreen TV; to a player the screen is in a vertical orientation. Mame works like a charm with the 90 degree clockwise rotation setting.
I'd like to play other games on the cab as well so I'm looking for a list of emulators or recommendations for emulators supporting a similar feature.

I haven't been able to find a commandline .exe that allows me to rotate Windows from portrait to landscape. Having Windows in landscape mode for other things is preffered (my collection of Steam games with a USB joypad for example).

So what emulators can you recommend? Is it possible to emulate Dreamcast and Amiga games for example with a rotate switch? So far my Google-fu has failed me :-(

[Le Chuck]

Check Griffindodd's MvsC Revolution build, he did some "on the fly" rotation of the Win Enviro in there that worked out very well. 

[Felsir]

Thanks LeChuck!

Giffindodd in Google and this came up:
http://www.hyperspin-fe.com/forum/showthread.php?20295-HOWTO-Easily-flip-between-landscape-portrait-upside-down-etc

With this tool being exactly what I'm looking for. Tested it in Win7 and worked like a charm!