I noticed that there are a lot of services or Oracle in my WinNT-services, but a lot of them I don't know:
Can you help me with this?
OracleAgent service is the equivalent of unix's dbsnmp agent that enables the OEM to perform checks on the database.
OracleDataGatherer is the service responsible for gathering information from the remote/local database for the use of OEM.
CMAdmin and CMan are the Oracle Connection Manager services.
AppServerListener must be the Application Server Listener (I don't know for sure).