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Meaning of TT and SYS$INPUT?

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The Question is:

What is the logical TT used for in the following part of my login.com file:

The Answer is :

  Someone is redirecting I/O, and through a moderately ugly means.
  TT is your login terminal when an interactive process, while sys$input
  is the terminal (for interactive processes) and the command procedure
  (for DCL command procedures, whether an interactive process or batch
  or otherwise).  Non-interactive processes do not have a TT device.
  This command may well produce subsequent errors for non-interactive
  modes -- the OpenVMS Wizard might guess you are seeing unspecified
  errors, given that the discussion was raised here.

answer written or last revised on ( 17-DEC-2003 )

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