Description:

X11::Protocol is a client-side interface to the X11 Protocol (see X(1) for
information about X11), allowing perl programs to display windows and
graphics on X11 servers.

A full description of the protocol is beyond the scope of this documentation;
for complete information, see the I<X Window System Protocol, X Version 11>,
available as Postscript or *roff source from C<ftp://ftp.x.org>, or
I<Volume 0: X Protocol Reference Manual> of O'Reilly & Associates's series of
books about X (ISBN 1-56592-083-X, C<http://www.oreilly.com>), which contains
most of the same information.