What is a Drag link socket?

[Kneale Brownson]

At 01:22 PM 12/19/2002 -0500, SuffolkD at aol.com wrote:
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>[ Picked text/plain from multipart/alternative ]
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>Lister(s):
>Please, what is a drag link socket?
>-Scott in BOSTON

It's a socket (various drive sizes, but the one the Bentley recommends is
1/2" drive) that has what looks like a large flat-bladed screwdriver bit as
its working end.  Looks like:

           http://buy.snapon.com/catalog/search.asp?partno=GF22