The documentation can be pretty lame when it comes to these properties.
I've made a habit of creating and run macros similar to the following to
identify the various properties that might be in a given set of properties.
Once you find something that looks promising, I check to see what the
property value is, and whether or not it'll be useful.

  Function GetMiscDumpPane() As OutputWindowPane
     Dim ow As OutputWindow =
DTE.Windows.Item(Constants.vsWindowKindOutput).Object
     Dim pane As OutputWindowPane
     Try
        pane = ow.OutputWindowPanes.Item("MiscDumpPane!!!")
     Catch ex As System.ArgumentException
        pane = ow.OutputWindowPanes.Add("MiscDumpPane!!!")
     End Try
        Return pane
   End Function

   Sub DumpProjectProperties()
       Dim pane As OutputWindowPane = GetMiscDumpPane()
       For Each project As EnvDTE.Project In DTE.Solution.Projects
           pane.OutputString("Properties for " & project.Name & vbCr)
           For Each prop As EnvDTE.Property In project.Properties
               pane.OutputString("    " & prop.Name & vbCr)
           Next
           For Each configProp As EnvDTE.Property In
project.ConfigurationManager.ActiveConfiguration.Properties
               pane.OutputString("        " & configProp.Name & vbCr)
           Next
       Next
   End Sub

   Sub DumpSolutionProps()
       Dim pane As OutputWindowPane = GetMiscDumpPane()
       For Each prop As [Property] In DTE.Solution.Properties
           pane.OutputString(prop.Name & vbCr)
       Next
   End Sub

Ed Dore [MSFT]

This post is 'AS IS' with no warranties, and confers no rights.