As mentioned in the beginning the GP Service supports three different tasks:

•VertiGIS_PrintTask
Creates the print according to the requested parameters

•GetLayoutInfo
Provides information about the template, that allows the client to show the map frames in the browser

•GetIndexInfo
Calculates and delivers the map frame rectangles that cover the index line

 

For example in order to receive information about the print template available for VertiGIS Studio Printing Engine, it's possible to get the results via the Get Layout Templates Info Tasks ArcGIS Rest interface. The section results contains information e.g. About pageSize, pageUnits or customTextElements.