As long as you have a "green screen" (5250 terminal or emulator) you can display not only system operator messages but messages in any authorized message queue.
Press Shift-SysRq (or Shift-Esc on a PC) and a blank line appears at the bottom of the display. Type a 6, press enter and QSYSOPR magically appears!
Would you rather display another message queue? Press the same key combination above, followed by a 4 and the name of the message queue. Example: 4 RDAVIS shows my message queue without having to exit whatever display I currently have on the screen.