client.lua

local modemSide = "right"
local self = os.getComputerID()
if rednet.isOpen(modemSide) == false then
    rednet.open(modemSide)
end
local server = rednet.lookup("TREEFARM", "toxicgiraffe.local")
while true do
    if server then
        local sender, message = rednet.receive("TREEFARM")
        if sender == server then
            if message == "quit" then
                break
            else
                local id = shell.openTab(message)
                shell.switchTab(id)
            end
        end
    end
end