You can navigate to any view by sending a NavigationRequest event containing the right extensionId and context object. Extension id and context info are displayed in the view URL.
For instance the URL for the hosts list is the following (there is no specific context):
https://localhost:9443/vsphere-client/?#extensionId=vsphere.core.viHosts.domainView
The summary view URL of a specific host contains something like this:
extensionId=vsphere.core.host.summary;context=com.vmware.core.model::ServerObjectRef~07F74EC4-1A06-4D06-8787-9595F3E1BFDB:HostSystem:host-119~core
The context object is not something that you can make up, you need to get a hold of it before leaving its view if you want to be able to come back to the same view.