Normal EAs complete one information-processing cycle during some tenths or hundredths of a second.
Within this time,
the EA can have processed some parameters,
made a trading decision, provided the trader with some useful information and so on.
Having finished this part of its work,
the EA goes to waiting mode until a new tick comes. This new tick launches the EA again,
the program makes its appropriate operations again and returns to the waiting mode.
The detailed description of how the appearance of a new tick influences program operation follows next.