bug in at command

[jpm at BNL.ARPA]

I have heard that V7, Sys3, and Sys5 Unix has some sort of bug
in the "at" command. Every reference to the bug has been like
"BSD fixes it" with no explanation of what the bug is or what
non-BSD versions of Unix have it. Could somebody please tell
me, VIA MAIL, what this bug is all about? As usual I will post
a summary of any responses I get.

			John McNamee
		..!decvax!philabs!sbcs!bnl!jpm
			jpm at Bnl.Arpa