When working with SQL Server transactional replication, one of the common checks to see if things look healthy is to insert a tracer token into the replication data stream and see how long it takes to get to the subscribers.
This is a process that can be very tedious if you have multiple publications to check, as you need to go to the replication monitor, click on the publisher, then go to tracer tokens tab and insert a tracer token. Then wait to see the result. If you need to do this more than a couple times, you may be waiting for a while.
As a result, Steve has created a way to simplify this. Click through for that script.