Usage:
After executing /paste, every line of input (including lines that begin with "/") will have prefix prepended to it and then get sent to the current socket. If prefix is omitted, it defaults to ":|". Entering the line "/endpaste" turns this off. /Paste can be very useful when using the cut-and-paste mechanism of many windowing systems.
Note that /endpaste is not actually a command, but a "magic cookie" recognized by /paste. "/Endpaste" and SIGINT (ctrl-c) are the only ways to end /paste.
See: /quote