Im not aware of anything that will let you do that other than something like this.

http://www.avsuperstore.com/moreinfo.../QuadView%20XL

But as you can see its a bit unrealistic on the price. You might find a similar product w/o as many bells and whistles for cheaper.
Im not sure how many boxes you are running. At least 4 from the sound of it. If you dont mind not seeing all 10 clients then your best bet would be to get a good KVM.

http://www.dell.com/content/products...en&s=bsd&cs=04

Something like that maybe.