Int 2C Fn 0000  P - Rm386 V6.00 - Cloaking - Allocate Gdt Selector         [m]

   AX = 0000h
   EBX = base address
   CL = access mode byte
   CH = extended access mode byte (omit limit field)
   EDX = segment limit

Return: CF clear if successful
       AX = selector
   CF set on error
       AX = error code (see below)
Program: RM386 (RAM-MAN/386) is the memory manager included in Helix Software's
     Netroom

Note:  this INT 2C interface is used by Netroom's DPMI.EXE v3.00

See Also: AX=0001h,AX=0002h,AX=0003h,AX=0004h,AX=0005h,INT 31/AH=57h

Values for error code:
 0001h no more selectors
 0002h not a GDT ring 0 selector
 0003h invalid selector (out of range, not user selector)
 0004h selector not allocated