What issues would one hope to find using static call graph analysis on a program? FxCop uses static call graph analysis, what issues does it find using this technique?

<http://msdn.microsoft.com/library/bb429476.aspx>  

<http://en.wikipedia.org/wiki/Callgraph>

Apologies for my lack of knowledge, I found some information via google, but fear that it is vastly incomplete. Thanks!