Making each open session the active window, this example displays the name of the session that is currently active.
Sub Main()
Dim Sys As Object, Sess As Object
Set Sys = CreateObject("EXTRA.System")
' Assumes one or more open sessions
Set Sess = Sys.ActiveSession
For i=1 to Sys.Sessions.Count
Set Sess=Sys.Sessions.Item(i)
MsgBox "Activating session " + Sess.Name + "."
Sess.Activate
Next
End Sub