DTS and DTR are cooperating tasks that perform various functions to
   exercise network software. DTR functions as a slave to DTS. DTS
   initiates each test by issuing a connection request to DTR. DTS
   passes parameters pertinent to the type of test request to DTR in
   the optional data of the connection request. The user interface to
   DTS consists a group of commands:

        CONNECT
        DATA
        DISCONNECT
        INTERRUPT

   You may abbreviate command keywords and qualifiers to four characters
   or less (if unique).

   Note that, when using DTS commands in a batch job, you must use uppercase
   characters in the command.