It’s time to pause for just a moment of theory. You need to understand the concept of a race condition and how such conditions can occur in your ColdFusion applications. Simply put, a race condition is any situation where two different page requests can change the same information at the very same moment in time. In many situations, race conditions can lead to undesired results. In other situations, you may not care about them at all.
We seriously recommend taking a few moments to really visualize and understand this stuff, especially if you are going to be using application variables to hold values that change over time (especially values that increment numerically as your application does its work).
Here’s an ...