In DEC DATATRIEVE you can have a startup file that is executed
       each time you invoke DEC DATATRIEVE. To set up a startup file,
       create a file containing the DEC DATATRIEVE commands you want
       performed at the beginning of each DEC DATATRIEVE session. Then
       create a logical name DTR$STARTUP that points to the file.

       For example, you could include the following in your LOGIN.COM
       file:

       $ ASSIGN "DISK3:[MORRISON]DTRSTART.COM"  DTR$STARTUP

       Whenever you invoke DEC DATATRIEVE, it starts by looking for the
       file pointed to by DTR$STARTUP and processing all the commands
       contained in that file.