Following up from the last post, you may be interested in a little reading on Sun’s explanation of the semaphore and shared memory settings for Solaris Kernel parameters, using /etc/system.

set semsys:* is for System V Semaphores
set shmsys:* is for System V Shared Memory
set msgsys:* is for System V Message Queues

My personal server OS of choice is OpenBSD, so if you know OpenBSD, then think /etc/sysctl.conf as it is similar.