D>2</TD><TD>single zero byte</TD><TD>Take picture</TD></TR>
<TR><TD>4</TD><TD>single zero byte</TD><TD>Finish session immediately</TD></TR>
<TR><TD>5</TD><TD>single zero byte</TD><TD>Take preview snapshot (retreivable as frame zero)</TD></TR>
<TR><TD>6</TD><TD>single byte</TD><TD>Autofocus calibration or testing (?)</TD></TR>
<TR><TD>7</TD><TD>single zero byte</TD><TD>Erase current frame *</TD></TR>
<TR><TD>8</TD><TD>single byte</TD><TD>Switch LCD mode.  Arg value:
	<BR>1 - off
	<BR>2 - viewfinder
	