1. Non-socket program
2. Socket program
1. Days before firewall
Everyone can easily create socket user program then the user program contacted someone else on the internet to say:
1. status of the program; alive or not alive.
2. Give or send the contain of a file.
2. Socket program
1. Days before firewall
Everyone can easily create socket user program then the user program contacted someone else on the internet to say:
1. status of the program; alive or not alive.
2. Give or send the contain of a file.
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