In reply to stingray_tara:
In Germany they are called "Panik-Exe" (panic draw), and can be used to clip bolts from further below than when using a normal quickdraw. They also have a modified carabiner that holds the gate open until it snaps shit when the bolt hanger touches the inside of the carabiner.
I guess you can also use them for aiding, but I haven´t seen this done.
The one Beal makes is called "beal panic", e.g. seen here
http://www.bergfreunde.de/beal-panic-cliphilfe/
Grivel and Kong have similar sets.
CB