Just a few notes on oddities that IRIX has compared with other Unix systems (just like Solaris, Linux, AIX, *BSD, etc).
IRIX has a name service cache daemon which sometimes seems to hang onto incorrect values for longer than it should. Clearing the cache is easy and quite useful if you have DNS problems :-
sudo nsadmin restart
Just don't assume that this cache is the cause of your problems ... it usually isn't.
Download RealPlayer8 from here, and install it.
Next find the plugins directory of your favourite browser, and copy the relevant files into it :-
cd /opt/firefox/plugins
cp /opt/real/rpnp.so .
cp /opt/real/raclass.zip .
chmod a+r raclass.zip rpnp.so