in reply to NMS, London PM?

Your choice of title NMS, London PM? could be better.

What file is this code in? Does it have documentation?

Note the "==1"s. Also, the quickest glance through the CGI::Cookie perldoc shows that you can use values for -expires like '3M': ...So, is the above supposed to be a secure version usage of the CGI::Cookie module? If so, why?
No. I don't see why you would think that. I think the various ==1 parts are probably typos. Its hard to say without context.

MJD says "you can't just make shit up and expect the computer to know what you mean, retardo!"
I run a Win32 PPM repository for perl 5.6.x and 5.8.x -- I take requests (README).
** The third rule of perl club is a statement of fact: pod is sexy.