Int 15 Fn 12  - Topview - Send Message - "readn" - Get Next N Object Byte  [Q]

   AH = 12h
   BH = 12h
   BL = window to read from
       00h handle is DWORD on top of stack
       01h read next N chars or attributes on task's default window
       0Ch (DV 2.26+) read window of task owning handle on top of stack
       0Dh (DV 2.26+) read default window of parent of current task
   STACK: DWORD count

Return: STACK: DWORD number of bytes actually read
          DWORD address of buffer containing data

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

See Also: AH=12h/BH=04h"WINDOW",AH=12h/BH=05h"WINDOW"