You will need to read data from the COM+ Catalog:
"The COM+ catalog provides a layer of abstraction over the actual details of where and how COM+ configuration data is stored. Much of the data is stored in the COM+ registration database (or RegDB), which holds data for all configured components installed in COM+ applications. This database is used at application run time to provide configuration data to COM+ to properly activate objects in an appropriate context, enabling services to be provided for objects per their configuration. The RegDB itself is a transacted resource manager that uses DTC transactions through the compensating resource manager; when you make persisted configuration changes, they are committed transactionally. The only way that you can access the RegDB is through the COM+ catalog, using the COMAdmin objects or the Component Services administrative tool."
It sounds like you may be able to connect to the COM+ Catalog RegDB database using VB.net:
Have a look at the above at page 350+ and you may be able to get some ideas, going further this isn't something I've done before as i'm not a developer so these are just purely links that may provide you with more information.