INFLD supports the keyboard command (Control-P) to capture a picture (or “snapshot”) of the screen. As this is mostly a user-oriented activity, it is discussed in the A-Shell Setup Guide (which see). To use this capability under program control, use MX_SCRNPIC (which see in the A-Shell XCALL Reference).

If you specify the TYPE code |S (vertical bar, capital S) in an INFLD call, it will automatically generate a screenshot (appending it to the current BUF file) on exit from the field. By adding SBR=INFDEF:|S  to the MIAME.INI, you can arrange to create a “slide show” of an entire session. This can be helpful for creating documentation, or for monitoring background processes, or for “snooping” on users (or simply for filling up the disk and creating useless system overhead.)