Description

   You can use EXCHANGE in two ways. You can work interactively
   (within the utility) by entering "EXCHANGE" at the DCL prompt.
   This invokes the utility, which responds with the EXCHANGE>
   prompt. You can then enter any EXCHANGE command. You must invoke
   the utility and use it interactively if you want to execute
   more than one EXCHANGE command. However, you can enter a single
   EXCHANGE command at DCL level. For example, the following command
   entered at DCL level lists the directory of a foreign volume:

   $ EXCHANGE DIRECTORY DMA1:/VOLUME_FORMAT=RT11

   When you use EXCHANGE at the DCL level, the utility returns you
   to the DCL prompt after it completes its task. If you are using
   EXCHANGE interactively, you can return to DCL at any time by
   typing EXIT or CTRL/Z.

   You can direct output from EXCHANGE operations in several ways.
   The command qualifier /[NO]MESSAGE allows you to control the
   default display of information from EXCHANGE MOUNT, INITIALIZE,
   and DISMOUNT operations. When you use the EXCHANGE commands
   COPY, DELETE, RENAME, or TYPE, include the /LOG qualifier to send
   information about the files being processed to SYS$OUTPUT. When
   you use the EXCHANGE command DIRECTORY, use the /OUTPUT[=file-
   spec] qualifier to direct the output to a specified file. If
   you specify the /OUTPUT qualifier without a file specification,
   the output is directed to SYS$OUTPUT. To send the output to a
   printer, use the /PRINTER qualifier with the DIRECTORY command.