• Registry (the REGISTRY command)
    • The registry is a table of named references to all running commands.
    • It allows commands to communicate with other commands by name.
    • When a command is run in the background (or run in a pipe) an entry for it is added to the registry.
    • The registry can be accessed via a table (REG) or the REGISTRY command (usually shortened to REG). 
      nM> plot/bg world.prm
nM> reg
  T: REG             = Table of 3 entries
  O:  PLOT           = P: PLOT,FILE=world.prm,/BG=
  O:  SHELL          = nxm.sys.lib.Shell@c1cd1f
  T:  HANDLERS       = Table of 3 entries
    • The registry table has three special entries:
      SHELL Entry for the NeXtMidas shell.
      HANDLERS Table of handlers (file, packet, resource, etc.)
      MAIN When running inside a macro only, an entry for the current macro.
    • The registry table has entries for the currently running commands.
      • By default each entry has the same name as the command being run.
      • If multiple commands with the same name are run, a number is added after the name.
      • If the /ID=<name> switch is used, the <name> is used. (This is extremely common inside a macro.) 
        nM> plot/bg/id=myplot world.prm
nM> reg
  T: REG             = Table of 3 entries
  O:  SHELL          = nxm.sys.lib.Shell@c1cd1f
  T:  HANDLERS       = Table of 3 entries
  O:  MYPLOT         = P: PLOT,FILE=world.prm,/BG=,/ID=myplot