The Overlay function makes it possible for you to display different securities on
a single chart. This function can be used to compare the relative strength between
different securities.
Common uses include comparing the Share Price Index Futures with the All Ordinaries
Index, comparing a security like BHP with the All Ordinaries Index, and comparing
securities of the same sector. A popular investment strategy is to only buy the
strongest securities in the strongest sectors.
The screen shot above charts the CBA security prices with the ANZ security prices.