Choose one of the MultiJVM modes if JavaTest can directly start your product (for example, from a command line in a Windows command window or UNIX shell). In a MutliJVM mode, each test is executed in its own VM started by JavaTest.
Choose SingleJVM mode if the system under test does not support multiple processes (for example, in point-and-click environments or in browsers).You will need to configure JavaTest agent to run the JCK tests in the same virtual machine on the test system.
In the MultiJVM group mode, a group of tests shares one VM instance across execution.