Is - operator of language VBScript

Used to compare two object reference variables.
result = object1 Is object2
If object1 and object2 both refer to the same object, result is true; otherwise result is false. Two variables can be made to refer to the same object in several ways.
In the following example, o1 has been set to refer to the same object as o2:
Dim o1, o2
Set o1 = o2
The following example makes o1 and o2 refer to the same object as o3:
Set o1 = o3
Set o2 = o3
The example for testing the returned Nothing value:
Dim oItem
Set oItem = oData.Item("abc")
If oItem Is Nothing Then
  ' ... error
End If
PROMOTIC 8.3.19 SCADA system documentation - MICROSYS, spol. s r.o.

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