TSM Trivia Question

[Prather, Wanda]

OK, so this is a stupid question, but:

When you use the Web admin interface and look at a list of nodes

 (like you open Operation View, Work with Client Nodes, Update a Client
Node),

all the nodes have a little icon of a PC on the left.  Some of them also
have a lightning bolt icon.

Anybody know what that lightning bolt means??
I can't find anything in error when looking at the attributes of the node.