Rational Performance Tester (RPT) 8.5.x and below used to have Citrix and SAP protocols, which needed separate recording of HTTP component and Citrix and SAP component, which were put in a single user group and executed. This meant the test execution of the HTTP and Citrix / SAP components were not possible.
But, in RPT 8.6 version both HTTP and Citrix / SAP components can be recorded at a single go. Hence the script recorded can be played back directly rather than creating a test schedule just to run a single script.
During regeneration as well, multiple protocols can be used to generate a single script.