[RESOLVED] session side-effect which existed until PHP 4.2.3.

[taurus5_6]

What does it mean:

Warning: Unknown(): Your script possibly relies on a session side-effect which existed until PHP 4.2.3. Please be advised that the session extension does not consider global variables as a source of data, unless register_globals is enabled. You can disable this functionality and this warning by setting session.bug_compat_42 or session.bug_compat_warn to off, respectively. in Unknown on line 0

This appears in my login page for my membership details page. WHat does this message mean?

Furthermore, at the top of my page appears this error:

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent

[bpat1434]

The headers means that something (white-space or HTML) is already sent to the browser before you call session_start().

The other error, I'm not sure. have you looked in the manual dealing with the session to see what existed until 4.2.3 and was taken out in later releases?