Data spaces and hiperspaces are similar in that both are areas of virtual storage that the program can ask the system to create. The size of this space can range from four kilobytes to two gigabytes, according to the user's request. Unlike an address space, a data space or hiperspace contains only user data or user programs stored as data. Program code cannot run in a data space or a hiperspace.
The following diagram shows, at an overview level, the difference between an address space and a data space or hiperspace.
The major difference between a data space and a hiperspace is the way your program accesses data in the two areas. This difference is described later in this chapter. But before you can understand the differences, you need to understand what your program can do with these virtual storage areas.
