JSI Tip 4196. What is the effect on Active Directory and FRS of advancing the time on your computer?

Microsoft Knowledge Base Article 289668 contains the following summary:

In the course of troubleshooting Active Directory or File Replication Service (FRS) replication issues, as the administrator, you may want to advance the system time of a computer to make the content of one computer have authority over another, or to force deletion of tombstoned objects in Active Directory.