An input file is a text file that you can edit. DTM
  translates and writes all input, commands, and comments
  in a session file to an input file.

  You can use an input file to create a new session
  file from an existing session file for an interactive
  terminal test only.

  To create an input file, perform the following steps:

  1. Pull down the Testing menu.

  2. Choose the Extract... menu item.

  To use the input file to create a new session file,
  perform the following steps:

  1. Pull down the Testing menu.

  2. Choose the Record menu item and the Terminal...
     submenu item.

  The Record dialog box contains an Input file field for
  use with an interactive terminal test.