In the current code, hitting ctrl-C in the shell behaves differently on Windows than on Linux, and in neither does it cleanly exit multi-line mode the way it did in Linux version 1.8.

1) Capture ctrl-C at the "read from keyboard" step in Windows like we do in Linux and respond the same way in both;
2) Cleanly exit multi-line mode in both Linux and Windows the way we did in 1.8;
3) Decide whether ctrl-C should ever exit the shell (it does now) or if it should just cancel the current input line (if executed at an active prompt);
4) Decide what it should do if the shell is waiting for a response from the server.