About semaphores

[Vladimir Sysoev]

I install Iserverd on my FreeBSD 4.6 server and it reports to 
/var/log/messages : Not enough semaphores. change kernel parameters.

I try to use sysctl kern.ipc... but these parameters are read only.

1. Does anybody know about how to increase maximum semaphores counts?
2. Where can I obtain information about kernel(sysctl) parameters (books 
manuals and others).
Mail me.
Thanks.
Vladimir