Defines the maximum memory (in kilobytes) that the session is allowed to use. This value can also be changed via the START directive.
Note: The maximum setting is 1,048,576 (1024*1024), which is 1 GB of memory.
If an application wishes to allocate more than this, it can set the 'IZ' system parameter, which when set, tells the system to ignore the value set in 'SZ'. When 'IZ' is set, the maximum memory will be determined by the OS.
Note: For older Windows versions of PxPlus, this value was set to 1024 or the maximum memory available, whichever was less. For older UNIX/Linux versions, this value was 512.