Z parameters in direct access URL

Hi all,

I have the direct access URL for "Business Activity" and I could able to launch the URL directly to a particular activity in edit mode in a browser. I want to add few more optional parameters in the URL so that the UI fields are updated in the activity when the URL is triggered. I have seen this sort of an URL in another project and it is working as expected. But I could not decode the logic behind the Z parameters in the URL.

Please help !

Thank you.

Regards,

Karthi M R.