SYNTAX            : CTRL_P

FUNCTION          : The text area is repositioned to display the previous
                    page of the buffer. The (new) current line (the one
                    with the cursor on it) will be displayed in the middle
                    (or immediately below if the number of lines in the
                    text area is even). The cursor will always be moved to
                    the beginning of the (new) current line.

NOTE              : When nearing the beginning of the buffer, it is
                    possible that no full page-up action is possible. In
                    that case, only a partial scroll is performed, but no
                    error or information message is generated. This function
                    will only result in an error if it is called when the
                    cursor is already positioned at the top of the buffer.

MATRIX