It will start the one pointed to in the registry, most likely CR9. To explicitly start a particular version, you can do:

This.crApplication = CREATEOBJECT("CrystalRuntime.Application.8.5")
This.crApplication = CREATEOBJECT("CrystalRuntime.Application.9")

>Is anyone using the 9.2 runtime? If both 8.5 and 9.2 are on my machine how can I tell which one is being started when I issue the following:
>
>This.crApplication = CreateObject('CrystalRuntime.Application')
>This.crReport = CreateObject('CrystalRuntime.Report')
>
>TIA
>Mike