Historical trend gives the operator a complete flexibility in designing the interface to your trend. You can create scooters that the operator slides over the trend to access a variety of data based on the scooter's current location. For example, when the operator positions the scooter over an area on the trend that has visible data, the time and values at that location for all database values being trended is returned to you. You can also create buttons to zoom in and out between the scooters or to data, such as the maximum to minimum value. Average and standard deviation can be displayed for the complete chart or for the area between the scooters. Historical trends can also be scrolled by any amount of time.