Find Out the TrustLevel of a Running Process
The trustlevel parameter is a legacy thing that is related to software restriction policies (SRP) in Group Policy. It allowed an administrator to run a otherwise blocked program.
SRP used to have three levels: restricted, unrestricted and "default user". The "default user" setting was retired with Windows Vista, so this parameter isn't useful anymore, and there's only one trustlevel available anymore.
Please note that the trustlevel does not relate to UAC integrity levels.