98 Blazer Keyless entry programming

Just bought a used Blazer and it didn't come with owner's manual. Can anyone tell me how to tell if it has keyless entry? It's 4 dr 4wd LS model and it doesn't look like it was standard.

http://www.automotiveforums.com/vbulletin/showthread.php?threadid=8206&perpage=15&pagenumber=1


I just did it on my 2000 blazer, it only took a minute.