Mac OS X 4k73!!!!!

I have just recently installed Mac OS X 4k73 on my computer and its pretty nice I havn't used it much I don't see a huge diffrence between 73 and 60 but mabey I havn't used it enough.....
Fogot to ask something I've been meaning to ask :p

In OS 9 you can assign an app to the function keys.... in the Public Beta that funtion does not exit (or at least I have not found it). HAs apple revived this function ?

ok i know i am new at this but I have can't find the sites, i have downloded the client but I am frustrated at this point......