ARCHOS box rock - Manual (Page 16)

SELECTED OPTION PLAY/STOP FUNCTION
filename Moves the cursor left (STOP) or right (PLAY) within the filename
character bar
Moves the character bar to the next (PLAY) or previous (STOP)
character.
BACKSPACE PLAY deletes the character before the current cursor position
DELETE PLAY deletes the character at the current cursor position
ACCEPT PLAY exits the virtual keyboard and saves any changes
ABORT PLAY exits the virtual keyboard and discards any changes
16 Rockbox User Manual