//unfortunately, have to wrap the docs in a C comment for doxygen
/**
\page qw_cap_spec QW Capabilities String

Client capabilities are specified using the "*cap" info key.  The info string
is made up of single char flags (possibly with modifiers, though currently
none exist).

Defined capabilities (* = not implemented):
\li z   client can accept gzipped files.
\li h   http transfers
\li f   * ftp transfers
\li a   * audio channel (voice chat)
\li i   * irc
\li p   pogo stick control
\li t   team messages

For more information on z and h, see \ref qw_download_spec.

The QuakeForge clients will not send "*cap" to the server unless "QF" or "EXT"
is detected in the challenge string sent by the server.

From the QuakeForge quakeworld server:

\verbatim
    if (sv_extensions->int_val) {
        extended = " QF qtv EXT";
    }

    // send it to the client
    Netchan_OutOfBandPrint (net_from, "%c%i%s", S2C_CHALLENGE,
                            svs.challenges[i].challenge, extended);
\endverbatim
*/
