The Globus Toolkit 3

Grid Services sound great, don't they? However, if you've already programmed grid-based applications, you're probably thinking that this is all very nice, but hardly enough for The Grid. Grid Services are only a small (but important!) part of the whole GT3 Architecture, which offers developers plenty of services to get serious with Grid programming.

OGSI (i.e. "Grid Services") is the 'GT3 Core' layer. Let's take a look at the rest of the layers from the bottom up: