NAME

       XPAChanges - Changes For Users from XPA 1.0 and 2.0

SYNOPSIS

       This document describes changes that will affect users who migrate from XPA 1.0 to XPA
       2.0.

DESCRIPTION

       There have been a few changes that affect users who upgrade XPA from version 1.0 to
       version 2.0.  These changes are detailed below.

       •   XPA commands no longer have a resolver routine (this is open to negotiations, but we
           decided the idea was dumb).  For the SAOtng program, this means that you must
           explicitly specify the access point, i.e.,:

             cat foo.fits | xpaset SAOtng fits

           instead of:

             cat foo.fits | xpaset SAOtng

       •   By default, xpaset, xpaget, etc. now wait for the server callback to complete; i.e.,
           the old -W is implied (and the switch is ignored).  This allows support for better
           error handling.  If you want xpaset, etc.  to return before the callback is complete,
           use -n switch:

             echo "file foo.fits" | xpaset -n SAOtng

       •   The old -w switch in xpaset and xpaget is no longer necessary (and is ignored), since
           you can have more than one process communicating with an xpa access point at one time.

       •   The new -p switch on xpaset means you need not read from stdout:

             xpaset -p SAOtng colormap I8

           will send the paramlist to the SAOtng callback without reading from stdin.

SEE ALSO

       See xpa(n) for a list of XPA help pages