Starting in 10.6, a new parameter has been introduced in the URL API. The purpose of this feature is to allow a user to execute a dashboard and when the dashboard is returned it will have selected specific sheet.
To take advantage of this feature, the user can either specify a key, which can be obtained via code or in the html; or they can specify the sheet based on the index. The two approaches are described below:
Obtaining the key via code or HTML:
When using this option, the URL API parameter is layoutKey, and can be appended as seen in the following example (the following syntax is for IIS):
http://ServerName/MicroStrategy/asp/Main.aspx?evt=3140&src=Main.aspx.3140&documentID=D0DB0DE9456554711034F1ABB5B248FB&layoutKey=W63

Specifying the value based on the index:
To use this approach, the parameter layoutIndex will be used, this parameter is the index of the sheet and starts with the number 0; so, if we have 10 sheets and we wanted to select the 5th one, we would specify layoutIndex=4, and the syntax will be like the one below:
http://ServerName/MicroStrategy/asp/Main.aspx?evt=3140&src=Main.aspx.3140&documentID=D0DB0DE9456554711034F1ABB5B248FB&layoutIndex=4