Found out that entries at HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\ that contain "verb" subkey represent OLE containers.
Like
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{GUID_HERE}\verb\
Question:
Is this necessary and sufficient condition to distinguish COM and OLEs (i.e is this trait necessary for all OLE's or not)?
OLE containers do not need to have any subkeys. In fact, they do not need to have any registry entries at all. All they have to do is implement a few predefined interfaces.
If you are talking about OLE servers, they usually implement some verbs that can be called through IOleObject.DoVerb(). They also usually implement MiscStatus.
