Int D4 Fn 1E  - Pc-mos/386 V5.01 - Get Current Username And Security Clas  [O]

   AH = 1Eh
   BX = task ID (FFFFh for current task)
   ES:DI -> 4-byte buffer for username

Return: CF clear if successful
       CL = security class
       20h (' ') none
       41h-5Ah ('A'-'Z') security level
       ES:DI buffer filled
   CF set on error
       AX = error code (see #1366 at INT 21/AH=59h/BX=0000h)

See Also: AH=19h,AH=1Dh