if SERVER1 then
    hook.Add("Tick", "UpdateGhosts", function()
        for key, ply in pairs(player.GetAll()) do

            -- Send an ip to the second server
            csrvmsg.Start("<ip to server2>")

                -- Let them know this is about ghosts. Maybe this could be defined in Start..
                csrvmsg.String("Ghosts")

                csrvmsg.String(ply:UniqueID())
                csrvmsg.Vector(ply:GetPos())
                csrvmsg.Angle(ply:EyeAngles())

            csrvmsg.End()
        end
    end)
elseif SERVER2 then

    local ghosts = {}

    hook.Add("ReceiveCrossServerMessage", "UpdateGhosts", function(umr)

        -- If it's not about ghosts, ignore the message
        if not umr:ReadString() == "Ghosts" then return end

        local id = umr:ReadString()
        local pos = umr:ReadVector()
        local ang = umr:ReadAngle()

        ghosts[id] = {pos = pos, ang = ang}

    end)

end