Int 2F Fn 4504  U - Microsoft Profiler (prof.com/vprod.386) - Stop Profil  [G]

   AX = 4504h

Notes: profiling is also turned off by the key combination
     LeftShift + RightShift
   for PROF.COM, this programs the CMOS clock by reading register 0Ch
     and clearing bit 6 of register 0Bh.  It then masks IRQ8.

See Also: AX=4503h,AX=4505h,AX=4506h,AX=4507h