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         plot the facet


      INSTRU = 11 : CLEAR SCREEN    (CLEAN)
      ----------

         all existing plots are deleted


      INSTRU = 12 : DISPLAY OF A SEGMENT. HIGHLIGHT (DSPLAY, HIGHLT)
      ----------

         I1 : 0 = normal display
              1 = highlight (blinking ...)
         ICH(1) = segment number


      INSTRU = 13 :  OPENING A SEGMENT  (OPENG)
      ----------

         ICH(1) = segment number

                 a segment represents a sequence of graphical 
                 instructions defined between openg and closeg.


      INSTRU = 14 :  CLOSING A SEGMENT  (CLOSEG)
      ----------


      INSTRU = 15 :  KILL A SEGMENT  (KILL)
      ----------

         ICH(1) = segment number


      INSTRU = 16 :  REMOVE A SEGMENT  (REMOVG)
      ----------

         ICH(1) = segment number


      INSTRU = 17 :  INQUIRE SCREEN SIZE  (SZSCRN)
      ----------

         OUT : V1(1) = abscissa of the lower left-hand corner in cm.
               V1(2) = its ordinate in cm.
               V1(3) = abscissa of the upper right-hand corner in cm.
               V1(4) = its ordinate in cm.
         The screen is thus defined in cm.


      INSTRU = 18 :  INQUIRE IF SEGMENT EXISTS  (INQEXS)
      ----------

         IN  : ICH(1)= segment number
         OUT : I2= 0 if the segment exists, 1 if not


      INSTRU = 19 :  LIST OF EXISTING SEGMENTS  (INQNXS)
      ----------

         IN : I1 = 1  initialization of the search
              I1 = 0  request next segment number
         OUT : if I1 = 0
               I2 = 0 if there is a next segment
                      ICH(1) number of this segment
               I2 -= 0 if there is no segment following


      INSTRU = 20 :  UPDATE SCREEN  (UPDATE)
      ----------


      INSTRU = 21 :  END, CLOSE DEVICE  (ENDDEV)
      ----------

         IN : I1 : terminal number


      INSTRU = 22 :  GO TO STEREO MODE  (STEREO)
      ----------

         IN: I1=1 (on) I1=0 (off)
         OUT: I2 =0 stereo
              I2-=0 no stereo


      INSTRU = 23 :  CURRENT COLOR  (INQCOL)
      ----------

         OUT : V1(1), V2(1), V3(1) reals between 0. and 1. giving R G B
               (proportion of Red, Green, Blue)


      INSTRU = 24 :  SET CURRENT COLOR  (SETCOL)
      ----------
 
         IN  : set the current color equal to the value in the array
               closest to (V1(1), V2(1), V3(1)


      INSTRU = 25 :  NUMBER OF COLORS  (INBCOL)
      ----------


         OUT : I1 : number of colors possible
                    (background color and at least the other : I1 >= 2)


      INSTRU = 26 :  DEFINE THE COLOR ARRAY   (SETTBC)
      ----------

         IN  : Set V1(1:), V2(1:), V3(1:) [0...1] in the color array
               between indices I1 and I2 inclusive.
               Indices I1 and I2 varies from 0 to nbcolo-1. 
         OUT : I3 = 0 assignment performed
               I3 = -1 table not modifiable


      INSTRU = 27 :  NUMBER OF COLORS  AND ARRAY   (INQTBC)
      ----------

         OUT : returns in V1(1:), V2(1:), V3(1:) [0...1] 
               the current color array between the indices I1 and
               I2 inclusive.
               Indices I1 and I2 varies from 0 to nbcolo-1.


      INSTRU = 28 :  HARD CLIP FOR TEXT   (CLIPHD)
      ----------

         IN  : V1(1)  min in x of the zone, in cm.
               V1(2)  max in x
               V1(3)  min in y
               V1(4)  max in y
               I1 = 1 clip, 0 if not


      INSTRU = 29 :  SELECTIVE DELETION  (INQFAC)
      ----------

         OUT : I1 : 0 if selective deletion is possible, 1 if not


      INSTRU = 30 :  EXISTENCE OF INPUT  (INQCUR)
      ----------

         OUT : I1 : 0 if there is input at the cursor (or other),
               1 if not
               If there is input we keep the same terminal number
               (see ITRCTG : adapting to a new input terminal)


      INSTRU = 31 :  MAXIMUM TEXT QUALITY  (INQMQT)
      ----------

         OUT : I1 =0 if the maximum text quality is HARD  
                     (le text soft est plus mauvais que le hard)
                  =1 if the maximum text quality is SOFT



      INSTRU = 32 :  TEXT CENTERING  (CTRTXT)
      ----------

         IN  : V1(1) = alpha   position in a box (0., 0.) (1., 1.)
               V1(2) = beta    of the center of the text in x (alpha)
                               and y (beta) : alpha and beta between 0. et 1.
               By default alpha = beta = 0.
          

      INSTRU = 33 : INQUIRE MAXIMUM NUMBER OF SEGMENTS MANAGED  (INQSGM)
      ----------

         OUT :  I1 = maximum number of segments managed (0 = none)
      if i1 >0 this signifies that ALL instructions are managed correctly:
                                   ===
                   12   DSPLAY
                   13   OPENG
                   14   CLOSEG
                   15   KILL
                   16   REMOVG
                   18   INQEXS
                   19   INQNXS
                    


       INSTRU = 34 : RETURN THE NUMBER OF THE CURRENT COLOR   (INQNCO)
      ----------

         OUT :  I1 = number of current color
                  


       INSTRU = 35 : hardcopy   (HARDCP)
      ----------
          IN: I1 = choix1  (if different hardcopy terminals)
              I2 = choix2  (if different material possibilities)
</PRE>
<P>
Inspired by the programs already proposed, we define the different actions as a function of the 
possibilities offered by the graphics terminal at our disposal.
<P>
 The fictitious subroutine, PEREXE, residing in library <b> perf-example</b> can serve as a model
when creating the output program for a new  device.
<P>
<P>
<P>
 In addition, a certain number of subroutines were written to aid with a 
quick implementation of the drivers (see chapter <A HREF="node92.html#chap_intern">7</A> and the index):
<P>
    <PRE> 

      GETUNF     RCHARS      RINTG
      RREAL      CHARI       WCHARS
      ZCENTR     ZCOLOR      ZFNDTC
      ZGNUM      ZGTEXT      ZSTROK
      ZTXT
</PRE>
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