Huh? That's not very helpful Jakkedup. Are you sure you posted this in the right thread?
If there aren't any packages for NRPE -> AIX, then you'll need to get the source code and compile NRPE yourself. In the end that will produce only two files which can be easily distributed across your servers.
And the online documentation about NRPE should help you to understand how NRPE works. Please just be sure to read it all. If you don't get it, come back with -specific- questions.
For now, stay as far away from SNMP as you can It's not for the beginning Nagios user.
That sentence doesn't make any sense You want to monitor an AIX box, as if it were running Winodws and Linux? Could you please restate your question?