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Most often, discontiguous saved segments (DCSSs) are used to share READ only storage between two or more virtual machines. An example is a DCSS for CMS. The CMS DCSS is more than 300K bytes. By sharing a DCSS, all CMS machines can point to one 300K+ section of memory, instead of having one copy per machine. CA Top Secret protects both shared and unshared discontiguous saved segments (DCSS). With the DCSS keyword and the TSS PERMIT command, you can secure standard program products such as PROFS, SAS, and VSAM that run as a DCSS. For example, the following allows USER03 to use the shared portion of the SAS system which resides in a DCSS:
TSS PERMIT(USER03) DCSS(SAS)
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