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INT 2F - Multiplex - DOS 4.x only SHELLB.COM - COMMAND.COM INTERFACE
        AX = 1902h
        ES:DI -> ASCIZ full filename of current batch file, with at least the
                 final filename element uppercased
        DS:DX -> buffer for results
Return: AL = 00h  failed, either
                  (a) final filename element quoted at ES:DI does not match
                      identity of shell batch file quoted as parameter of most
                      recent call of SHELLB command, or
                  (b) no more Program Start Commands available.
        AL= FFh  success, then:
                memory at DS:[DX+1] onwards filled as:
                DX+1:   BYTE    count of bytes of PSC
                DX+2: N BYTEs   Program Start Command text
                        BYTE    0Dh terminator
Explanation: COMMAND.COM executes the result of this call in preference to
        reading a command from a batch file. Thus the batch file does not
        advance in execution for so long as SHELLB provides PSCs from its
        workspace. The PSCs are planted in SHELLB workspace by SHELLC, the user
        menu interface. The final PSC of a sequence is finished with a
        GOTO COMMON, which causes a loop back in the batch file which called
        SHELLC so as to execute SHELLC again. The check on batch file name
        permits PSCs to CALL nested batch files while PSCs are still stacked
        up for subsequent execution.