\C{intro} Introduction to PuTTY

\# PuTTY is an SSH and Telnet client

\# Section on `what is Telnet? what is SSH?' for the people who
\# don't have the first clue what they are. Explain what they're
\# good for and why you might want to use one, and explain under
\# what conditions you might _not_ want to use one.

\# Section on `what's the difference between Telnet and SSH?' where
\# we evangelise - POLITELY! - about SSH and security