b

local modem = peripheral.find("modem", rednet.open)
local printer = peripheral.find("printer")
local px, py
if rednet.isOpen(modem) then
    print("Modem is innitiated")
else
    printError("Problem or something")
end
rednet.host("main", "router")
-- Making 0xa an identifier for a computer that has just joined network
rednet.broadcast("0xa-router")

print("Listing online hosts")
local online = rednet.lookup("main")
print(#online .. "Computers online")
print("Listing computers online: ")
for _, host in pairs(online) do
    print(host)
    px, py = printer.getCurserPos()
    printer.write(host .. " ")
    printer.setCurserPos(0, py+1)
end