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bz_hasPerm
bool bz_hasPerm (int playerID, const char* perm)
Checks to see if the player specified has the permission specified.
Parameters: 
playerID  -  The id of the player to check 
perm  -  The name of the permission to check for 
Returns: 
True if the player specified has the permission specified, false if they do not have the permission specified
Example
Using a groups file, if you specify the +OPERATOR permission (You make it up) and then check for that permission upon a player join, you can as an example, set a player as the operator.
case bz_ePlayerJoinEvent: {
	if (bz_hasPerm(((bz_PlayerJoinPartEventData_V1*)eventData)->playerID,"OPERATOR")) {
		bz_setPlayerOperator(((bz_PlayerJoinPartEventData_V1*)eventData)->playerID);
	}
}break;