Manages the configuration and tracking of Component Object Model (COM)+-based components. If the service is stopped, most COM+-based components will not function properly. If this service is disabled, any services that explicitly depend on it will fail to start.
You will receive, in the Event Log, an entry from "DCOM" complaining about not having this service running if disabled. If set to manual, many services report to it, so it will start anyway. For the fun of it, check:
"C:\Program Files\ComPlus Applications"
On your system, see if you have any installed "COM+" Applications. This service is required for System Event Notification.
None at this time.
Default XP Pro x64: Automatic
Safe Setting: Manual
Service Name (registry): COMSysApp
Display Name: COM+ System Application
C:\WINDOWS\system32\dllhost.exe
Account: Local System Account
What service COM+ System Application needs to function properly:
What other service require COM+ System Application to function properly:
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Windows Service Configurations!
Includes explanations of each service and advice on which services you can safely disable.