What are the mounts called that can hold a desktop computer on the back of an lcd monitor?

Added (1). but an actual full size desktop. We have them at work and someone asked me to remove it so they can unplug a wire in the back of the computer that is otherwise inaccessible.
Added (2). The link is a picture of an example but that's a mini computer.
Added (3). Here's a better picture -- http://accessories.us.dell.com/sna/productdetail.aspx?c=us&l=en&s=gen&sku=a7023615#Overview

For some reason they have the computer installed in the wrong direction where the back ports are blocked by the base of the stand.

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