returns the version of DBE supported by the server.
to the major and minor
DBE protocol version supported by the server. If the DBE library is
compatible with the version returned by the server, this function returns
does not support the DBE extension, or if there was an error
during communication with the server, or if the server and library protocol
versions are incompatible, this function returns zero. No other Xdbe functions
may be called before this function. If a client violates this rule, the
effects of all subsequent Xdbe calls that it makes are undefined.