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Int 2F Fn A900 - Metztsr.com - Installation Check [U]
AX = A900h
CF set
Return: CF clear if resident
AX = 97FFh
CF set if not present
Notes: METZTSR.COM prevents METZ applications (such as the MAGIC screen
saver) inactivity timeout while running a DOSapp under MS Windows.
the default multiplex number is A9h, but may be set to any value from
80h to FFh with a commandline switch
See Also: AX=A901h,AX=A902h
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