net.timeout = 60
function net.open(A,V)
 local st=computer.uptime()
 net.send(A,P,"openstream")
 repeat
  _, F, P, D = computer.pullSignal(0.5)
  if computer.uptime() > st+net.timeout then return false end
 until F == A and P == V and tonumber(D)
 V=tonumber(D)
 repeat
  _, F, P, D = computer.pullSignal(0.5)
 until F == A and P == V
 return socket(A,V,D)
end