Test to see if a session is active
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an object to test
other arguments for methods
In order for a TFXsession to be active, it must have been
authenticated less than 1 minute ago. If it was created
snapshot=TRUE it will become inactive after
it is used once.
This function assumes that if the session has not been used in 60 seconds is not active, even though TrueFX sessions actually stay active for roughly 70 seconds.
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