[taeric]

This actually doesn't seem that hard. In both, you are telling the computer, not the target program, something. One is to signal the running program you want to interrupt it. The other is to close the input to the program, as you are done giving it data.

[nixpulvis]

You're making a lot of assumptions about the setup. Granted they are all mostly standard.

[taeric]

Assumptions help the world go around. :)

[nixpulvis]

And... the Devil's in the details.