You will have to make a camera and constantly update its position, or set it to follow the person by setting its movetype to MOVETYPE_FOLLOW and it's EV_ENT_aiment to the ent it should follow, and then update the camera's angles to that of the player's as well I believe.
EV_INT_user1-4 are just custom variables put in by Valve so mod-makers had more space to easily store data.
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No longer around. Thanks your support, everyone! As always: