[ADMIN] Postgres and Multiple Processors

[Hitesh Patel]

I am running Postgres on a Linux 2.2.11 box with 2 Pentium III 550
processors.  It appears that postgres is only using the first processor
and not both.  Is there a compile-time switch I need to enable to make
postgres use both processors or is this not currently supported? 
Also... does anyone have some documentation on replication using
postgres?  I looked in the archives but couldn't find anything complete
enough to use.