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Hello i am new in this forum and i have big question

Before 2 days i have played Halo Demo (i own Halo PC and i played it and in Halo CE like 1.5 years and i was real bored so i now playing Halo demo) and i have seen something amazing ,some how,i dont know how i have entered as usual to the server and i was surprised
why? because i was playing there King of the hill and there was a ghost and tanks and it was in halo DEMO and after that we played Team Slayer and i didnt use any mod so i want to know HOW the hell can i do that ??? and please note It was not a mod
so some one know how to do that. THANKS

im guessing, the prolly switched the Biped of the warthog, though i htink the tank is available in demo.

1.The tank isn't available in Halo Demo

2.Please give me the answer only if you know.

THENKS.