INT 9F - VIRUS - "INT13" - STORAGE FOR USER INT 13h VECTOR
Note:	while it is infecting a file, the INT13 virusA program which attaches itself to other programs for the purpose of duplicating itself.	Viruses often (but not always) contain harmful code which is triggered by some event, after a certain number of reproductions, or on a specific date.  See also worm. grabs INT 13 and uses
	  this interrupt to store the existing INT 13 vector for later
	  restoration
SeeAlso: INT 9C"VIRUS",INT 9D"VIRUS",INT D3"VIRUS"