INIT-DISP  ( - )<p>
DESCRIPTION<p>
<tt><b>INIT-DISP </b></tt>  completely redraws the Autoguider display.  The
current values of the variables containing Seeing, Magnitude Relative
transparency, etc are read out.  <p>
The displaying is all controlled by one single background task.  It has three
inputs: 1. a command queue of byte tokens, each of which corresponds to one
display routine.  2. a flag to enable a single window image display routine. 3.
a flag to enable a possibly reconstructed image display and also to update the
displayed guiding parameters occasionally.<p>
The reason for the background display is partly to optimise the data processing
of the system, but also to work around a bug in the OPAL display driver which
causes a system crash.  This has worked quite successfully, reducing the number
of system crashes considerably, and allowing freedom to send many commands to
the display.  One limitation is that if you write an image to a non existent
part of the screen, then the system will fail.  To stop this, the window
handling code must be robust.<p>
The crashes are usually accompanied by a bright blue display screen, and are
know as Opal blues,  the cure is initially to use RECOVER which will
re-initialise the display and then call INIT-DISP.<p>
Once we move to a version 4.2 system, we will be using a new OMNICOMP display
card and graphics interface, and hopefully these problems will vanish.<p>
CALLING PARAMETERS<p>
None.<p>
INITIAL/DEFAULT VALUE<p>
None<p>
RETURN VALUES<p>
<b>None</b><p>
<b></b>RESTRICTIONS<p>
	The CCD temperature was for the last time it was read.  On loading,
the value is undefined.<p>
EXAMPLE  <p>
<tt>ok</tt><p>
<tt>INIT-DISP</tt><p>
<tt>ok</tt><p>
<tt></tt><p>
<tt></tt