How many variables can be registered in one session?

Does anybody know how many variables can be registered in one session? I can’t find in the PHP Manual where it tells how many variables a session can hold.

Here’s what the Manual says at the beginning:
[url]http://www.php.net/manual/en/ref.session.php[/url]

[quote]

The session support allows you to [B]register arbitrary numbers[/B] of variables to be preserved across requests. When a visitor accesses your site, PHP will check automatically (if session.auto_start is set to 1) or on your request (explicitly through session_start() or implicitly through session_register()) whether a specific session id has been sent with the request. If this is the case, the prior saved environment is recreated.

[/quote]

I combed through the Manual the other day but could not find any information that tells about any limitations on variables that can be contained within a session.

I would appreciate any help.

Thanks.

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