Int 2F Fn 4B20  - MS Windows 3 - Win.com - Set Program To Execute On Exit  [W]

   AX = 4B20h

Return: AX = 0000h if successful
       DX:CX -> 256-byte buffer for pathname and commandline (see below)

Note:  when the Windows function ExitWindows is called with an exit code of
     44h, WIN.COM executes the program specified in the returned buffer
     and then restarts Windows

Format of buffer:
Offset Size    Description
 00h 128 BYTEs ASCIZ pathname of program to execute
 80h 128 BYTEs commandline for program