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INT 15 - TopView - SEND MESSAGE - "READ" - READ NEXT LOGICAL LINE OF WINDOW
        AH = 12h
        BH = 04h
        BL = window to read from
            00h handle is DWORD on top of stack
            01h use calling task's default window
            0Ch (DV 2.26+) default window of task owning handle on top of stack
            0Dh (DV 2.26+) default window of parent task of current task
Return: STACK:  DWORD number of bytes read
                DWORD address of buffer
Notes:  reading starts at the current logical cursor position; the cursor is
          updated to point at the character following the last one read
        any translucent blanks (FFh) which are visible on screen are changed
          to the character which is seen through them
        the string produced by the read is placed in an input buffer which may
          be reused by the next READ or READN of a window
        window stream opcodes D8h and D9h determine whether the read returns
          characters or attributes
SeeAlso: AH=12h/BH=05h"WINDOW",AH=12h/BH=12h