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INT 15 - TopView - SEND MESSAGE - "READ" - GET NEXT RECORD FROM OBJECT
        AH = 12h
        BH = 04h
        BL = object
            00h handle is DWORD on top of stack
                mailbox: wait for and get next message
                keyboard: wait for and get pointer to next input buffer
                pointer: wait for and get next message
            02h get next message from mailbox (task's handle on top of stack)
            03h get next message from current task's mailbox
            04h get the next input from keyboard (handle on top of stack)
            05h get the next input from task's default keyboard
            06h wait for input from any object in OBJECTQ (handle on stack)
            07h wait for input from any object in task's default OBJECTQ
Return: STACK: (if objectq) DWORD handle of object with input
               (otherwise)  DWORD number of bytes
                            DWORD address
Notes:  for a keyboard in keystroke mode, the input buffer is a single byte
          containing the character code as returned by the BIOS; the BIOS scan
          code is available via the STATUS call if the character is zero
        for a keyboard in field mode, the input buffer format is determined
          by the field table header for the window the keyboard is attached to
        keyboard input buffers and mailbox message buffers may be invalidated
          by the next READ, ERASE, CLOSE, or FREE message to the same object
SeeAlso: AH=12h/BH=05h"OBJECT"

Format of pointer message:
Offset  Size    Description
 00h    WORD    row
 02h    WORD    column
 04h    BYTE    status
                bit 6: set when press/release mode active and button released
                bits 7-2: number of clicks-1 if multiple-click mode active
                bits 1,0: button pressed (00=none,01=button1,10=button2)
 05h    BYTE    field number or zero (APILEVEL >= 2.00 only)