I'm not sure if SSI is enabled on my board, but for question sake.. Let's say it is.. I'm really bent on having who's online say what forum members are reading.. so if I add that UBBLibrary2.pl code thats in the instructions for the who's online hack, the one that need SSI to call it.. would I need to change that cgi "UBBLibrary2.pl to UBBLibrary2.shtml?? If so do I need to change all my other cgi's to shtml?? And would changing it to SHTML, effect any current hacks???

I wish I could make a addon that could read where members are located anywhere on the site... kinda like the same effect imcheck.cgi has... Cause adding imcheck's IFRAME code in my control pannel's header, reads it anyone from the site... I wish someone could make something like that for UBB without SSI... this would be niceeeeee..

Uh, no. You never change your HTML's to SHTML's manually and never rename perl files to SHTML.
Just add this into an .htaccess file:

and upload it to your root directory.