HDMI Device In Sound Manager?

i am in the process of setting up my audio preferences but i'm confused about various aspects of windows 7 audio settings in the device/sound manager. my computers are part of a recording studio setup, and as such, one of my computers has an maudio 1010lt audio interface card. as my studio is also an entertainment setup, i began to investigate if win 7 has some kind of audio "profile" manager, whereby i might be able to select various "devices" or outputs that would automatically be selected when various applications are started. for instance, when i use my daw(reaper), i would like win 7 to automatically select the maudio card as the in/out as the maudio outputs(8) are connected to a patchbay, and are normalled to be connected to an analog mixer. however, if i am listening to audio on the net, like Internet etc, i would like the mobo onboard stereo(front) outputs to be selected by the os, as they are connected to a pair of standard computer powered speakers, as i do not want the mixer powered on during regular listening. and then there is the movie thing. since my mobo has stereo, 5.1, and 7.1 as well as s/pdif output jacks,(and input), from what i understand, the s/pdif output must be used for sound surround as the onboard realtec chips decode dvd etc to the s/pdif outputs, which i would like to connect to a soundsurround reciever, with 5.1 speaker setup, of which the front speakers are used for standard stereo listening..anyway, as i looked at the device/sound manager screen, i saw an "hdmi" device in the list.(see screenshot). well, i don't have anything in the computer that has an hdmi output. so, i am curious. can anyone tell me what this "hdmi" device is or what it is referring to?