scanner for volatile pair

Dears;

I am trying to develop a CBOT that check different tradable instruments / forex pair and send an alert when a specific criteria is meet for example ( ATR value).

I can do a straight forward Algo to do the above function but with defined instrument / pair – ie: a chart ( symbol and time frame). But can’t make it generic that do a scan on all tradable instrument by the broker

• I need help in my code by suggesting a code statement that do the following function

"  OnBar,  for each tradable pair check the following { // logic here } "  I can manage the rest of the CBOT.

• how to run that Algo without associating it to a specific /defined (symbol and time frame).