Using an Expert to trade on one chart using signals based on another?

["Owen Davies" <owen@xxxxxxxxxxxxx>]

Seems to me someone here not long ago wrote of using an
Expert to check data on one chart for use in a system running
on another chart.  I believe the example used an indicator on
a longer-term chart as a permission signal for a system running
on a short-term chart -- something along the lines of taking buy
signals on a 5-min chart only when an indicator was overbought
on the 60-min chart.  Can anyone tell me how this is done?
If it's in the manual, I've not found it.

Many thanks.

Owen Davies