Up First - VM/370 Special Keys
The standard PA keys (stands for Program Attention) are:
PA1 takes you from CMS back to CP
PA2 leaves your input area alone but clears the system's output area.
The PF (Program Function) keys are often set according to facility determined standards and have no
universal use. While in CP or CMS the current settings can be determined by keying "q pf"
in your input area.