INT 21 - FLU_SHOT+ v1.83 - INSTALLATION CHECK                                   
	AX = FF0Fh
Return: AX = 0101h if resident
Program: FLU_SHOT+ is an antivirus/antitrojan program by Ross M. Greenberg and
	  Software Concepts Design
Note:	the "PSQR/1720" 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. calls this function to determine whether
	  FLU_SHOT+ is present
SeeAlso: AH=FFh"VIRUS",AX=FF10h"VIRUS"