Session Types

Hi *,

I have an e-commerce site, using sessions/cookies.  However, right now it is
only using per session cookies, when you close the browser, the cookie is
gone.

How can I have certain cookies be persistent (as long as possible), while
others may expire after 4 hours, and if they only have per session cookies
enabled in their browser to fall back to that?  Is that possible?

Also, is it possible to set a cookie after information has been displayed to
the page, or can it only be done in the headers, before output?

Thanks,
Brian Allen
[email protected]