identifying a 3d object in 3d space

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FindChild ( entity,child_name$ )

ok so the command says, "Returns the first child of the specified entity with name matching child_name$."

So if my entity was ground and the child was cylinder5

FindChild (ground, cylinder5), this returns the 5th cylinder, but what does that mean :) If I want to be able to click on each cylinder with my mouse and have it change color, is that possible? (all cylinders are in the mesh, and are loaded in with ground = LoadAnimMesh ("ground.x")