GN_Cl, Close file

Register parameters

RST 20H, DEFW $6209
     IX = handle of open file

OUT, if call successful:
     Fc = 0
     IX = 0
OUT, if call failed:
     Fc = 1
     IX unchanged
     A = error code:
          RC_HAND ($08) - bad handle

Registers changed after return:
     ..BCDEHL/..IY same
     AF....../IX.. different 

Related calls

GN_Del, delete a file from memory
GN_Opf, open file/resource (wildcard search)
GN_Ren, rename file
OS_Cl, internal close (OZ usage)
OS_Del, file delete (internal OZ usage)
OS_Frm, file read miscellaneous
OS_Fwm, file write miscellaneous
OS_Gb, get byte from file (or device)
OS_Gbt, get byte from file (or device) with timeout
OS_Mv, move bytes between stream and memory
OS_Op, internal open (OZ usage)
OS_Pb, write byte to file, device
OS_Pbt, write byte to file, device with timeout
OS_Ren, file rename (internal OZ usage)

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