what is the meaning of this code ?

[MOGA672002]

function func_ircRaw (server,data)
	if servers[server][15] then
		writeLog("-> "..data)
		return sockWrite(servers[server][1],data.."\r\n")
	end
	table.insert(servers[server][16],data)
	return true
end
registerFunction("ircRaw","func_ircRaw","irc-server","string")

this line 

    if servers[server][15] then

[Captain Cody]

server.15 in the table servers exists then continue on.