Portrait Dialogue. What does the "Allow multiple instances" checkbox mean in Branch Type Properties in Dialogue Admin?

The option Allow multiple instances offers the option of having multiple branches of the same type when designing a dialog.

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For example, the Select using selection branch in the Select operation type can be used many times - in contrast to the branch Expiry that is only used once and for which the option
Allow multiple instances is disabled.
The option Allow multiple instances is enabled for those branches for which it is meaningful to use them multiple times.

UPDATED:  April 3, 2017