space CONT-d in csh...

[System Janitor]

So I just noticed that the key sequence      SPACEBAR^d      (that's a 
space and a control d) causes csh on ultrix to print the names of all
the csh builtins and every file name in PATH.

I just went through the man page, and unless I missed it, this feature
is not described there. It doesn't work this way on suns. What's the
story here... is this a useful thing?

-Mike