I recently found a number Apple restore and install discs as a Hamfest/computer show. This guy was mostly selling PC stuff but he had a box full of install media and I collected an assortment for $5.

Can this install media only be used with the indicated models printed on the discs or can they be used on other models as well?

I have these machines (all from thrift stores or hand-me-downs and none of them came with discs of any sort):

• iMac G3 - Summer 2001 (Snow colored)
  Power Macintosh G3 (Beige Desktop)
  Power Mac G4 AGP - Sawtooth
  eMac (I believe it's the 1.42 GHz model)

I have these discs:

• Power Macintosh G3 (All-in-one)
  An iMac set with software restore and install discs hand labeled "Blue iMacs" with SSW version 9.0.4 dated 2000
  eMac Media with OS X install discs labeled OS X 10.2 dated 2002
  Mac OS 9.0 dated 1999
  An iMac Software Restore and Install set SSW version 8.5.1 dated 1999
  An iMac Software Restore and Install set SSW version 8.6 dated 1999
  

Are any of those discs applicable for the machines I have? I've collected used Macs for awhile now but I've never tried reloading an OS before so this is all a bit new to me.

There's also a set that says XServe media labeled version 10.2 with several discs that say Netboot, Admin Tools, Macintosh Manager 2, Mac OS X Developer Tools, Web Objects 5 and Apple Hardware Test XServe. Am I missing the actual OS disc for that set?