Private Sub Form_Load()
    Dim objApp As SolidEdgeFramework.Application
    Dim objDoc As SolidEdgeAssembly.AssemblyDocument
    Dim objPlanarRel As SolidEdgeAssembly.PlanarRelation3d
    Dim lngIndex As Long
    Const TESTFILE = "T:\vbtests\testcases\Sample.asm"
    ' Report errors
    Const PI = 3.14159265358979
    ' Create/get the application with specific settings
    On Error Resume Next
    Set objApp = GetObject(, "SolidEdge.Application")
    If Err Then
        Err.Clear
        Set objApp = CreateObject("SolidEdge.Application")
        Set objDoc = objApp.Documents.Add("SolidEdge.AssemblyDocument")
        objApp.Visible = True
    Else
        Set objDoc = objApp.ActiveDocument
    End If
    Call objDoc.Close
    ' opening an existing assembly document
    Set objDoc = objApp.Documents.Open(TESTFILE)
    ' getting a planar relation object from the assembly document
    Set objPlanarRel = objDoc.Relations3d.Item(3)
    ' getting the index of the relation in the collection
    lngIndex = objPlanarRel.Index
    ' USER DISPLAY
    ' Release objects
    Set objApp = Nothing
    Set objDoc = Nothing
    Set objPlanarRel = Nothing
End Sub