This was a tool which I had written when I was working in Support back in 2003 to 2005. The issue was that Support was getting alot of customers who didn’t want to upgrade their site, so they wanted different versions of Actinic v6 to run on one machine. They had asked the developers if this could be achieved, and nothing came around from it.
Arming myself with a spare copy of Visual Basic v6.0 and checking the registry for Actinic, I managed to do the impossible at that time, have multiple versions of the software, run on one PC 
. They grew into my first Support tool which was Actinic Multisite, Which shouldn’t be confused with what Actinic are selling right now. In fact, I shouldn’t have used that name, it should have been called Multi Version of something
Here is a very simplified diagram of how the Support tool works
Actinic Support Tool Multisite
The workflow of the program is that you launch Multisite, select the version which you want to run, then Multisite imports the registry into the operating system, setting up the CLASSID for the Payment Service Provider and registering the Actinic OCX files, as well as other registry entries needed, then manually launches the Catalog executable from a pre-defined path and poll in the background waiting until the Actinic s/ware closes, then becomes alive again and saving all registry entries needed.
