Detecting FSMO role holders *without* using special tools/methods.

I want to know if it's possible to detect the five FSMO roles without using the Windows Server GUI or tools like dcdiag, dsquery, netdom, PowerShell, vbscript, WMI, etc.

Essentially I want to determine whether or not a server holds one or more of theActive Directory FSMO roles but simply by looking at:

• Registry keys/values on the server.
• Certain files being present on the server.
• A specific process or processes running on the server.
• Specific services running on the server.

Thanks in advance  :)