multiple postmasters

Hi,
We're running postgresql 7.0.2 on solaris 5.7. The admin docs say that only
one postmaster process should be running. However, our "master" postmaster
process (PID=560 below) appears to have spawned off a couple of other
postmaster processes:

UID PID PPID C STIME TTY TIME CMD
bimaadm 560 1 0 Nov 27 ? 1:24 /appl/bima/pgsql/bin/postmaster -S -i
bimaadm 10237 560 0 17:16:53 ? 0:04 /appl/bima/pgsql/bin/postmaster -S -i
bimaadm 10240 560 0 17:17:00 ? 0:06 /appl/bima/pgsql/bin/postmaster -S -i

Is this normal? If not, what could be the cause of this? Our user
interface currently processes queries using the Pg.pm perl module and the
JDBC interface.

Thanks
Dave

--
David Mehringer, Ph.D. University of Illinois
dmehring(at)astro(dot)uiuc(dot)edu National Center for Supercomputing
Research Scientist, Applications/Department of Astronomy
Software Applications Developer, 1002 W. Green St.
BIMA Data Archivist Urbana, IL 61801 USA
voice: 217 244 5468 fax: 217 244 7638
http://monet.astro.uiuc.edu/~dmehring/dmehring.html