There are two processes that do most of the work for Now X. They are "Now" and "Now X". You can see these running in the Activity Monitor application (/Applications/Utilities/Activity

Beginning with PB2, when you force quit "Now" it will automatically quit "Now X" as well.

NOTE: Now X stores its data in an ACID compliant database so that force quitting the agent shouldn't cause data loss for data already saved into the database.
John Wallace
Now X Tech Lead
President, Now Software, Inc.