Each protocol supports a method for sending a command to the remote system. This method is used to transmit a series of commands between the two UUCP packages. At all times, one package is the master and the other is the slave. Initially, the calling UUCP is the master.
If a protocol error occurs during the exchange of commands, both sides move immediately to the final handshake.
The master will send one of five commands: `S', `R', `X', `E', or `H'.
Any file name referred to below is either an absolute file name
beginning with `/', a public directory file name beginning with
`~/', a file name relative to a user's home directory beginning
with `~USER/', or a spool directory file name. File names in
the spool directory are not absolute, but instead are converted to file
names within the spool directory by UUCP. They always begin with
`C.' (for a command file created by uucp or uux),
`D.' (for a data file created by uucp, uux or by an
execution, or received from another system for an execution), or
`X.' (for an execution file created by uux or received from
another system).
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