INT 2F U - TKERNEL (Borland DOS extender) - INSTALLATION CHECK
        AX = FBA1h
        BX = 0081h
        ES:DI -> 16-byte buffer
Return: if installed, first four bytes of ES:DI buffer are "IABH"
Note:   TKERNEL is a licensed version of AI Architects/Ergo's OS/x86.  It was
          present only in Borland C++ 2.0; with version 3.0, the DOS extender
          was moved into DPMILOAD.
SeeAlso: AX=F100h,AX=FBA1h/BX=0082h,AX=FBA1h/BX=0084h,INT 15/AX=BF02h