Some form of logical line identification must also be made.
         For example, if a straight line is to be drawn across the
         display this fact should be transmitted, rather than a
         series of 500 short vectors.

         As things firm up, more and more complicated structural
         display information (in the manner of LEAP) should be sent
         and accommodated at user sites so that the responsibility for
         real-time display manipulation may shift closer to the user.

      imp ctrl   The server-host may also want to send control
      information to IMPs.  Formatting of this information is done by
      the host decoder.  [>tif(urt) <tif(decode)]

      The other control information supplied by the host decoder is
      message break up and identification so that proper assembly and
      sorting can be done at the user site.

   From the host decoder, information does to the invisible IMP, and
   directly to the NET-to-user translator.  The only operation done
   on the messages is that they may be shuffled.

   urt   The user reception translator accepts messages from the
   user-site IMP 1 and fixes them up for user-site display.  
   [>nif(d ctrl)>tif(prgm ctrl)<tif(imp ctrl)<nif(decode)]

      The minimal action is a reordering of the message pieces.
      
      dctrl   For display output, however, more needs to be done.  The
      NET logical display information must be put in the format of
      the user site.  Display control does this job.  Since it
      coordinates between (encode) and (decode) it is able to offer
      features of display management local to the user site.
      [>nif(display)<nif(urt)]

      prgmctrl   Another action may be the selective translation and
      routing of information to particular user-site subsystems.
      [>tif(dctrl)<tif(urt)]

         For example, blocks of floating-point information may be
         converted to user-style words and sent, in block form, to a
         subsystem for processing or storage.

         The styles and translation of this information may well be a 
         compact binary format suitable for quick translation, rather
         than a print-image-oriented format.

      (display)   is the output to the user.  [<nif(d ctrl)]

   
   USER-TO-HOST INDIRECT TRANSMISSION

      (net mode)   This is the mode where a remote user can link to a node
      indirectly through another node.   [<nif(decode)<tif(hrt)]


DEL SYNTAX

   NOTES FOR NLS USERS
  
      All statements in this branch which are not part of the compiler
      must end with a period.

      To compile the DEL compiler:

         Set this pattern for the content analyzer ( (symbol for up arrow)P1
         SE(P1) <-"-;). The pointer "del" is on the first character of pattern.

         Jump to the first statement of the compiler.  The pointer "c"
         is on this statement.

         And output the compiler to file  ( '/A-DEL' ).  The pointer "f"
         is on the name of the file for the compiler output -

   PROGRAMS

      SYNTAX

         -meta file (k=100.m=300,n=20,s=900)

         file = mesdecl $declaration $procedure "FINISH";

         procedure =

           procname (

              (

                 type "FUNCTION" /

                 "PROCEDURE" ) .id (type .id / -empty)) /

              "CO-ROUTINE") ' /

           $declaration labeledst $(labeledst ';) "endp.";

         labeledst = ((left arrow symbol).id ': / .empty) statement;

         type = "INTEGER" / "REAL" ;