A wireless touchscreen monitor.

One problem is the amount of data to paint the pixels could overwhelm the wireless making the screen very slow and not responsive most of the time.

the answer is simple

just use a standard consumer grade tablet and give it access to your home network, where you store your data( f.e. a FreeNAS), you have full acces via wifi and can manipulate the data.

Quick and Easy...so you can fly like this other guy named Lilienthal.....

I should have wrote in OP, but to be clear, I'm trying to avoid any sort of remote solutions, so as to avoid significant input lag. Also maybe I'm not getting it, but it sounds like you mean just being able to use a file explorer, which isn't the robust "pick up your desktop and go downstairs" sort of experience that I'm envisioning personally.

wireless data connections can have very fast data throughput- wireless N routers can handle up to 300Mbps for a local transfer, certainly fast enough to paint an HD picture on a screen in real time, as far I know. Consider Onlive. Onlive allowed you to game from a distant server over a WAN connection, and that generally required at least 15Mbps. Doing it in the same house definitely shouldn't be too much strain if you're using the appropriate wireless signal.

don´t forget you have to deal with transmission of Picture in one way and Input in the other with minimal lag...

I don´t get the point of your demand do you want to take the computing power of your pc around the house or do you wan´t to access its data wirelessly?

in both cases the singnls have to be processed resulting in a PC/tablett/ converted laptop that you take with you.

The point is minimal disruption to whatever project is at hand, and, yes pick up and continue work being done on the desktop computer around the house. The point of the project however, is to do exactly that without compromising. A true tablet or laptop will interrupt the flow of work and mean you have to re-open programs and windows. I simply am hoping for portable control of my desktop, with minimal input lag, which makes a monitor+receiver "shell" a much more attractive option. There is no need for it to be an independent system, and in fact for it to be would disrupt the nature of the idea.

How about http://www.wikihow.com/Use-Remote-Desktop-in-Windows-7

As I said in my last post I'm not interested in laggy remote solutions.

So my first statement stands. End of story! You need to read https://en.wikipedia.org/wiki/Frame_rate to understand why 300Mbits /seconds fails to deliver. 30FPS* 24bits for color* 1024 * 768 = 566Mbits/sec needed.
Clem

Onlive. Netflix, Plex, Chromecast, all of these services are impossible by your logic. This is an existing and simple tech, being applied slightly differently. The Wii U tablet is EXACTLY this tech and almost certainly could be modded in some way to do what I'm looking for.