process explorer is a more sophisticated variant of task mgr if you will. it can be retrieved from http://technet.microsoft.com/de-de/sysinternals/bb896653.aspx
in this case, the main advantage of pe above tasm mgr is the feature that pe displays processes in a tree structure (thus grouping child and sibling processes). also, it allows to find out additional process properties (such as a process being suspended) – and alter them.
cheers