INT 2F U - DOS 3.3+ internal - CLOSE FILE
AX = 1227h
BX = file handle
SS = DOS DS (must be using a DOS internal stack)
Return: CF set on error
AL = 06h invalid file handle
CF clear if successful
Notes:  can only be called from within DOS
equivalent to INT 21/AH=3Eh
SeeAlso: AX=1201h,AX=1226h,INT 21/AH=3Eh

See also: 2F1106

2F1227 - DOS 3.3+ internal - CLOSE FILE