The "Mode" column uses the following legend:

370A

Executes in 370 Accommodation mode, allowing a 370-only application to run in an XA or XC virtual machine.

TOL

Executes in XA toleration mode using 24-bit addressing and XA I/O.

EXP

Executes in XA exploitation mode using 31-bit addressing and XA I/O and can reside in a shared segment loaded above the 16 Meg line.

ESA/XC

Executes in ESA/XC mode (and marked with * if it uses Data Spaces)

ALL

End user virtual machine executes in any of the above modes (and marked with * if it uses Data Spaces). If marked with # restrictions apply to service virtual machine(s). Please refer to product documentation for complete details.

CLIENT

Executes on a workstation and communicates with VM/ESA running on a S/390 host system.