[gnu.emacs] chistory, electric-history how to use?

gregs@well.sf.ca.us (Greg Strockbine) (02/13/90)

Can someone please tell me what do I put in
my .emacs file so I can use either of these?
Also what is the difference between them. I
found them in the emacs-18.55/lisp directory.
	thanx, greg strockbine