!PrintException [-nested] [<Exception object address>]
This will format fields of any object derived from System.Exception. One of the more useful aspects is that it will format the _stackTrace field, which is a binary array. If _stackTraceString field is not filled in, that can be helpful for debugging. You can of course use !DumpObj on the same exception object to explore more fields.
If called with no parameters, PrintException will look for the last outstanding exception on the current thread and print it. This will be the same exception that shows up in a run of !Threads.
!PrintException will notify you if there are any nested exceptions on the current managed thread. (A nested exception occurs when you throw another exception within a catch handler already being called for another exception).
If there are nested exceptions, you can re-run !PrintException with the “-nested” option to get full details on the nested exception objects. The !Threads command will also tell you which threads have nested exceptions. The abbreviation !pe can be used for brevity.