CATCH-ALL TASK FOR UNMODIFIED RSX11M V3.2
                   =========================================

             There is a very large scale of  services  the  ...CA.   may
        provide, and only one limitation:
         - it must work fast, never wait for anything to complete,
           to be EVER  ready to process new command.
        For example, CCL from the KMS Kit is  very  good,  but  wizzards
        very often get MCR -- TASK ACTIVE message when trying to use CCL
        command before the previous one completed, and  you  have  large
        ...CA.  active for the whole time.  

             Following CA.  combines approaches from many  sources.   It
        is  possible  to  implement  it  without applying patch to DRSPW
        (SPAWN with EFN=-1) and it works in the same  way.   Conditional
        code  allows  CA usage on system without parrent-offspring task-
        ing.  No modifications to INS !!!  It's table-driven, so  faster
        than  any file-oriented, and is capable to pass the unknown com-
        mand to THIRD commands dispatcher.

        The fly of unrecognized  MCR  command  through  CA  starts  with
        search of dynamic-installable tasks table.
        If match, install this task, que original command line to it,
        	  request task marking it for remove on exit, 
        	  pass OCB to it and immediately exit CA.
        Or search the table of commands processed by indirect files 
        	  processor (AT. or any other PIN). If match, chain
        	  MCR using appropriet command and immediatelly exit CA.
        Or call SCP (Substituted commands parser) to try substitution
                  of original command to any other predefined.
                  If match, chain MCR with substituted line and exit CA.
        Or chain the third commands interpreter - ...CCL. Currently 
        	  we use original CCL from KMS-Kit (except DCL part).

             Dynamic install  significantly  reduces  pool  requirements
        (approx.  32 words per task), and you may use all tasks you wish
        as direct commands, passing MCR command lines to them.  Since we
        use  non-standard  priority  schema to break shuffling to death,
        and sub-systems spread in various directories, the table for dy-
        namic install specifies also priority and directory to be used.

             The table-driven SCP provides  very  simple  and  effective
        tool to define application-specific commands.  It internally in-
        cludes enhanced TCF (Terminal  Control  Function)  command,  and
        current  table  provides substitution of broad DCL commands sub-
        set, and simplified form for many  frequent  standard  MCR  com-
        mands.   Commands, which can't be processed by SCP, (for example
        if required parameter is missing), may be returned to CA to pass
        them to THIRD command dispatcher.

                                                                  PAGE 2



             Combined approach of very fast, table driven SCP  and  very
        flexible  CCL  seems to be best solution to all command-language
        problems.  For example, our DCL implementation has two levels:
        - complete commands are converted by SCP (very fast)
        - commands with any parameter missing are passed to CCL
          which prompts for missing parameter.
        Some DCL commands require more parsing logic, than  current  CCL
        provides.   Such  commands  (LINK,COMPILE,COPY) we process using
        reduced version of AT., installed as ...DCI.  Since it  is  all-
        most  allways  stopped  and  out of memmory, I don't worry about
        it's size.

             The table driven ...CA.  task requires relinking for  every
        change of tables, but CAGEN.CMD command file does all necessary,
        including VMR mofification of saved virgin system.   Overall  CA
        task  size (incl.  SCP and tables) for dynamic install of approx
        80 tasks, DCL support etc.  is only 2kW.
         
        Complete CA/CCL set consists of self-doccumenting files:
         
        CAGEN.CMD	- build or modify CA
        CCLGEN.CMD	- build modified CCL
        SCPGEN.CMD	- build substituted commands tester
        CA.MAC		- CA source
        SCP.MAC		- SCP source
        CATAB.MAC	- CA tables for dynamic instal  SCP
        CCL.MAC		- modified CCL source
        SYSCCL.CCL	- system CCL commands file
        LINK.CMD,COMPILE,COPY -  complicated DCL commands
         
         
        					Ing.Martin Brunecky
        					Drobneho 28a
        				60000 	BRNO
        					Czechoslovakia