Okay first go to the home page and look at documents.....and if you want to know functions look at funcwiki
http://www.amxmodx.org/funcwiki.php
And there are know classes,pointers, and some other stuff.....just look at the docs
http://www.amxmodx.org/doc/
And the end_round is most likely an enity...to my understanding..
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I can no longer help here......school has started... :/ goodbye everybody :'(