Outlook explorer instance having a unique ID

Private WithEvents MyExplorers As Outlook.Explorers
' How do I assign each MyExplorers instance with an ID, say oEXP1, oEXP2, oEXP3, ..., oEXPN?

Private WithEvents MyItem As Outlook.Items

Private Sub MyItem_ItemAdd(ByVal Item As Object)
    ' this event runs only when an explorer instance oExp1 exists  (active or not active)
End Sub

Private Sub Macro1()
    ' this macro runs only when an explorer instance oEXP2 exists
End Sub

Private Sub Macro2()
    ' this macro runs only when an explorer instasnce oEXP3 exists
End Sub

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I believe the above VB code is pretty self-explanatory, but how do I identify/detect each outlook explorer instances that is run, preferably by some unique ID?