Use case:

Click on a link in the collection page takes to the fly page

On click of the back button, it should go to the calling page.

This particular case is implemented in the Global configuration page.There is a return paramater encrypted on the below url when you click on options button from any component.

www.j-cook.pro/sandbox/cms30/administrat...=com_demo10311&path=&return=aHR0cDovL3d3dy5qLWNvb2sucHJvL3NhbmRib3gvY21zMzAvYWRtaW5pc3RyYXRvci9pbmRleC5waHA%2Fb3B0aW9uPWNvbV9kZW1vMTAzMTEmdmlldz1vcmdhbml6YXRpb25zJmxheW91dD1kZWZhdWx0

Regards
Vivek