Unfortunately that will not allow me to interrogate the web application since ordinary window adapter lacks the features of the Web Adapter.
I have received the following answer from Carlos Lopes from Pega:
You can modify the IE arguments for your web adapter by using the Advance Configurations option in the adapter properties and entering the setting 'IEOverrideArgs'. You will then enter the arguments desired. Plese note that you will need to also include 2 mandatory arguments when you do this, so in your customer's case, they will need to enter "-restart -noframemerging -inprivate" for the Value.
However when examining the process by process explorer I only see the default runtime arguments.