Summary of the differences

Table 1 shows some important differences between standard (both non-shared and shared) hiperspaces and ESO hiperspaces:

Table 1. Comparison of standard and ESO hiperspaces
Question	Standard hiperspace	ESO hiperspace
What authorization do you need to create the hiperspace?	Any, for non-shared; supervisor state or PSW key 0-7 for shared.	Supervisor state or PSW key 0-7
What authorization do you need to use the hiperspace?	Any, for non-shared; depends on use of an ALET for shared.	Supervisor state or PSW key 0-7
How do you write data to the hiperspace?	By using HSPSERV SWRITE	By using HSPSERV CWRITE
How do you read data from the hiperspace?	By using HSPSERV SREAD	By using HSPSERV CREAD
Does the system save the data in the address space buffer after a write operation?	No	Yes, unless you use KEEP=NO on HSPSERV
Does the system save the data in the hiperspace after a read operation?	Yes, unless you use RELEASE=YES on HSPSERV	Yes (although hiperspace data is always volatile)
What happens to the data in the hiperspace when the system swaps the owning address space out?	The system preserves the data.	The system discards the data.