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What does it mean with '0..* interacts with 0..*'?

What does it mean with '0..* interacts with 0..*'?
I was reading 'Client-Server Web Apps' by Casimir Saternos,
and found it in the feature 7.1 .

Is this common notation to represent for something? or coined by the author only here in this book?
Hope any clue.
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