This macro tells the IDE to display the transfer program's expanded parameter string in the Transfer Arguments input box for verification.

You can change or add to the string before it is passed to the transfer program.

The position of $PROMPT in the command line determines what is shown in the dialog box. You can place constant parameters in the command line by placing them before $PROMPT.

For example, the /c in

is constant and doesn't show in the dialog box, but dir can be edited before the command is run.