Not your usual DOS program

From: Andrew Kennedy (andrewkennedy2_at_LOGev1.net)
Date: 02/22/04 

Date: Sun, 22 Feb 2004 14:41:10 -0000

I am trying to analyze this program. This is the beginning code.

What I have learned is that the program uses a DOS extender.

If someone has time could you help me step through this so I can learn what
it is doing.
  
It doesn't have the normal MZ signature. It stops interrupts for a while
and uses the extra segment.

Thanks.

  cs:0000 FA cli
  cs:0001 16 push ss
  cs:0002 1F pop ds
  cs:0003 26A10200 mov ax,es:[0002]
  cs:0007 83E840 sub ax,0040
  cs:000A 8ED0 mov ss,ax
  cs:000C FB sti
  cs:000D 06 push es
  cs:000E 16 push ss
  cs:000F 07 pop es
  cs:0010 BEF003 mov si,03F0
  cs:0013 8BFE mov di,si
  cs:0015 B91000 mov cx,0010
  cs:0018 F3A4 rep movsb
  cs:001A 07 pop es