Amount of memory available to IPC::Shareable?

[Alexander Farber (EED)]

I would like to write a small web chat using IPC::Shareable.

How do I find out, how much shared memory is available on some
host, esp. under Solaris and OpenBSD? I have looked at "perldoc
IPC::Shareable" and the outputs of "dmesg", "ipcs -a" and
"ulimit -a" but don't see it yet.

Also, does anyone care to share his/her sources for a mod_perl 
based web-chat (modertion option would be great)? Thank you!