On this page, INFOPLUS displays the programs currently in memory.

  All programs that are resident, or currently running, have a small
signature in memory. This signature gives the name of the program (in most
cases),  and the memory it is using.

MCB:    Memory Control Block, the segment where the program is.
PSP:    Program Segment Prefix, holds specific information about the
        program. Various important vectors, pointer to the environment, and
        the commands you pass onto the program (like /h).
Parent: This is the segment that 'owns' the program. In other words the
        program that called it.
Env:    A block will show here if that memory block is the environment to
        a program.
Owner:  The program (or it's owner)
Interrupts: A list of interrupts (in hexadecimal) that the program appears
            to have taken over.