If you are configuring Access Services in a SharePoint 2013 farm, you may need to do some configurations at IIS. Indeed, for these modifications you will need to know the Application Pool linked to your Access Services service application. In order to know the Access Services Application Pool you have at least two possibilities:
First one is to execute the following PowerShell commands in the SharePoint 2013 Administration Console.
Once you execute these commands, you will get the Application Pool Id in the SharePoint 2013 Administration Console-
Option 2 is simply by accessing IIS and locate the Applications Pool with more applications (we are talking about a development environment). As you can see, the selected Application Pool has the same ID obtained with PowerShell.