VSdocman is used within MS Visual Studio .NET IDE as an add-in. You can load it (if it is not yet) as all other add-ins:
1.go to Add-Ins menu
2.then click Add-In Manager ...
3.select VSdocman item and run it.
It is a good idea to set it to load on startup. After that new VSdocman item appears in Add-Ins menu as well as in standard toolbar.