INT 15 - MultiDOS Plus - EXECUTE A MULTIDOS PLUS COMMAND
AH = 0Fh
DS:BX -> ASCIZ command
Return: after command has been processed
Notes:  specified string is executed as if it had been typed at the MultiDOS
command prompt
the task is placed on a queue which MultiDOS examines periodically and
is suspended until MultiDOS has processed the command
all lowercase characters up to the first blank are converted to upper
case within the given buffer


150F - MultiDOS Plus - EXECUTE A MULTIDOS PLUS COMMAND