I found two unknown functions and potentialy dangerous maybe?
mov al,00h
mov ah,13h
int 2f
This clear up the DOS from the memory. And it should not! All it says is
"Swap 13h and 19h". It doesn't say much. This function is used to check for
a free "hole" i mean from AH=0 to AH=FF
Another mysterious one is the following.
mov al,00h
mov ah,55h
int 2f
This one returns 0000. I have no idea why. Segment in memory refers to 
command.com
Any thoughts?
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