Documentation
3.3.4. Process-wide Security
To enable security for a specific application if that application has security needs that are different from those required by other applications on the machine. For instance, you might decide to use machine-wide settings for your applications that require a low level of security and a higher level of security for a specific application.
Security settings in the registry that apply to a specific application are sometimes not used. For example, the application-wide settings set in the registry using Dcomcnfg.exe will be overridden if a client sets security explicitly for an interface proxy. When enabling security for an application, several settings may need to be modified. These include the following:
