GetNETException[] returns the .NET exception object that was thrown in the most recent call from Mathematica to .NET.
LoadedNETAssemblies[] returns a list of all the .NET assemblies that have been loaded into the current session.
LoadedNETObjects[] returns a list of all the .NET objects that have been loaded into the current session.
LoadedNETTypes[] returns a list of all the .NET types that have been loaded into the current session.
NETAssembly["name", n] represents a .NET assembly with the specified name.
NETType["name", n] represents a .NET type with the specified name.
ReinstallNET[] is a convenience function that calls UninstallNET[] and then InstallNET[].
RemoveEventHandler[obj@event, delegate] removes the specified delegate from the named event.