LOADABLE MCRDRIVER -- EDDRV

          Included on this distribution tape is a prototype  MCR  driver
     with  a  loadable  data  base.   As  it was implemented before V3.1
     RSX11M, it includes the ability to return a user's logon  UIC.   It
     is  intended that this driver will be developed into a general tool
     for returning information from  the  EXECUTIVE  without  having  to
     write a specialized privleged task. The source files are EDDRV.MAC
     and EDTAB.MAC


          For those who would like to issue MCR commands from a task but
     who  do  not  have  loadable driver support in their system and who
     don't want to do another SYSGEN for a while, we are  including  the
     source  file  for  MCRUN.  Once MCRUN is built and installed in the
     user's system, any task can send an  ASCII  MCR  command  to  MCRUN
     using  the SEND directive.  Note, that the maximum lenght of an MCR
     command sent in this manner is limited by the length of the  direc-
     tive's  buffer  to  24 characters.  A rewrite of MCRUN using memory
     management directives could overcome  this  restriction.   For  now
     however,  the  first word of the send buffer is unused.  Words 2-13
     are a packed ASCII MCR command.
 
 
     NOTE: EDDRV as supplied recognizes only terminal numbers 0-6.  To
     change the number of terminals, the source must be edited to change
     the terminal number table at the end of EDDRV.MAC.