The SHAREOPTIONS (or SHROPTNS) parameter specifies how the component or cluster can be shared among users within one system or across systems.
TPX handles the integrity of the VSAM files itself using record 0 the VSI (VSAM sharing record).
Since we handle the integrity we want VSAM to do nothing, therefore, we use SHAREOPTIONS(4,3).
The Cross-region option helps in concurrent data access on a stand-alone system, for example TSO or CICS.
The Cross-system helps in data access for multiple computers (Two or more different computers that are interconnected)
The values of the various possible values for the above are mentioned below with their meanings: