Version control should be based on a version numbers included in a data area or database file in the shipped software library. This number should be incremented for each functional change—note that a single change may affect a number of different objects. Therefore, documentation of any changes can be related to the fix level.
A check for prerequisite versions can be made, either manually or automatically, in order to prevent installing successive releases in the wrong order. Operating system version levels can be checked by retrieving the relevant data area for:
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