With the release of the Globus Toolkit 3.x, you might find you need a custom GRAM client for your grid application. The "managed-job-globusrun" script from GT3 provides the equivalent to the "globusrun" command in GT 2.2.X. This script is great for command line execution, but for custom applications like grid portlets, Web apps, or servlets, a custom implementation might be better. Or, you might just want to understand how GRAM works on GT3. This article is a developer’s overview of a custom GRAM client for GT3.