Through data-in-virtual, a program can map a VSAM linear data set residing on DASD to a hiperspace. The program uses the read and write operations of the HSPSERV macro to transfer data between the address space buffer area and the hiperspace window.
When a program maps a data-in-virtual object to a standard hiperspace, the system does not bring the data physically into the hiperspace; it reads the data into the address space buffer when the program uses HSPSERV SREAD for that area that contains the data.
Your program can map a single data-in-virtual object to several hiperspaces. Or, it can map several data-in-virtual objects to one hiperspace.