In order to use of some of the features of the OPeNDAP core software, a
user's computer must have some additional software installed, and
available on the user's PATH , in
$DODS_ROOT/bin or $DODS_ROOT/etc.
wish Tcl /Tk interpreter (or whatever
program is indicated by the DODS_GUI environment variable) is
used by the GUI manager to provide a progress indicator
that displays the status of a pending data request as it is being
processed. It is also used by the error reporting system to display
error message received from the server.
gzip program, the GNU compression
software, is used to decompress data messages received from an OPeNDAP server. If this program is not installed, the OPeNDAP core software
tells the server not to send compressed messages, so data may still
be received. However, having the compression software installed and
available will increase the data transfer rate.
The required software, like OPeNDAP itself, is free software. Refer to Appendix A for information about acquiring that software.