At many installations, users must share access to data in a hiperspace. Users who are updating data for common use by other programs need exclusive access to that data for the period of time between the transfer of data from the hiperspace to the return of data to the hiperspace. If several users tried to update the same data at the same time, the result would be incorrect or damaged data. To protect the data integrity, you might need to serialize access to the data in the hiperspace.

Serializing the use of the storage in a hiperspace requires similar methods to those you would use to serialize the use of virtual storage in an address space. Use the ENQ and DEQ macros or establish your own protocol for serializing the use of the hiperspace.