The quoted program is intended to run on the remote machine, and deserializes the new program that the remote machine is supposed to start running. F is a vari

The quoted program is intended to run on the remote machine, and deserializes the new program that the remote machine is supposed to start running. F is a variable that stands for this new program that has been serialized and sent as an inter-process message, which in this case has been sent also over the network.