The Serviced Components Installation Tool (regsvcs.exe) loads and registers serviced component classes from .NET assemblies into COM+ applications. You can also unregister assemblies.
Assembly
The name of the assembly to install/uninstall from.
RegSvcs Mode:
"Find or create COM+ Application and Register Type (/fc)"
If a COM+ Application matching the assembly (or specified name) is found, it will be used. Otherwise, a new application will be created.
"Find existing COM+ Application and Register Types (/fc /exapp)"
If a COM+ Application matching the assembly (or specified name) is found, it will be used. Otherwise, the action will fail.
"Create new COM+ Application and Register Types (/c)"
A new COM+ Application will be created. If a matching COM+ Application already exists, the action will fail.
"Uninstall types (/u)"
Remove a previously registered assembly.
COM+ Application Options:
Application Name (/appname)
Specify a name for the COM+ Application to register or unregister (or ID of an application to unregister.) If no name is specified, the assembly file name will be used for the application name.
Partition Name (/parname)
Specify the name or ID of a COM+ partition in which to locate the assembly.
Application root directory (/appdir)
Specify a root directory for the COM+ Application.
"Do not reconfigure target application (/noreconfig)"
Only applies when registering components. Default behaviour is to reconfigure.
"Configure components only (/componly)"
Only applies when registering components. If this option is set, only components (not methods or  interfaces) will be reconfigured.
Type Library File
It is possible to specify a name (or path) to a specific type library file to generate/use.
If "Use existing type library" is checked, the type library will not be regenerated.