Interpreting MACD

[Tony Lonsdale <tonyl@xxxxxxxxxxx>]

Hi,
Here comes another "simple" question please...

I understand the basic rules for interpreting the MACD, as stated in the
MS Help file:
"The basic MACD trading rule is to sell when the MACD falls below its
9-period signal line.  Similarly, a buy signal occurs when the MACD
rises above its signal line"

But can someone please explain the significance of the Zero "line"?  

Is it significant to note whether the MACD value is above or below
zero?  

When it CROSSES the zero line (going up or down), is there any useful
interpretation to be gained?

Thanks again... Tony

----------------
Tony Lonsdale
Fishing Point
Australia
----------------