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Code Block
titleFN_FH (A = $03), Free handle
IN:  A = FN_FH ($03)
     B = handle type
     IX = handle

OUT, if successful:
     Fc = 0, IX = 0

OUT, if failed:
     Fc = 1, A = RC_HAND

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



Code Block
titleFN_AH GH (A = $04), Get (Find) handle (OZ 4.6 and newer)
IN:  A = FN_GH ($04)
     IX = first handle to test, 0 to begin with top handle
     B = handle type
     C = dyn id, 0 to bypass the check

OUT, if successful:
     Fc = 0, IX = handle

OUT, if failed:
     Fc = 1, A = RC_EOF

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

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