SCROLLBACK CLEAR %|[-all] [<refnum>]
SCROLLBACK LEVELCLEAR %|[-all] [<refnum>]
SCROLLBACK GOTO %|<+|-linecount>|<linenum>|<timestamp>
SCROLLBACK HOME%|
SCROLLBACK END%|
SCROLLBACK REDRAW

/SCROLLBACK, or the default alias /SB:

/SB LEVELCLEAR
   - Remove lines with level matching one of those
     specified in scrollback_levelclear_levels.
/SB CLEAR
   - Clear screen, free all memory used by texts in window.
/SB HOME
   - Jump to start of the buffer.
/SB END
   - Jump to end of the buffer.
/SB GOTO [[-|+]line#|time]
   - Jump to specified line or timestamp.
     time format is [dd[.mm] | -<days ago>] hh:mi[:ss].

See also: SET SCROLL