Int 2F Fn 4501  U - Microsoft Profiler (prof.com/vprod.386) - Setup Profi  [G]

   AX = 4501h
   BX = CSIPS buffer size in KB (first parameter for ProfSetup)
   CX = output limit in KB (second parameter for ProfSetup)

Note:  this call is not supported by PROF.COM

See Also: AX=4502h,AX=4503h