The file under the cursor in the source directory is appended to the command line. The file under the cursor including its path is appended to the command line. Hold down the CTRL key and use the up and down cursor keys to select an entry. By pressing the left or right key, you can edit the command line. This automatically closes the list.
TAB Puts the cursor back to the source directory.
If brief was selected, these keys move the cursor through the source directory. Cursor up and cursor down move the cursor bar inside the source window, even if it was inside the command line.