Marshall, could you please for-the-record remind us how to "check that the open worked?" (The underline implies a hyperlink that apparently is not there.) Likewise – show how to "know if it indeed works." A tiny example would be very beneficial to future readers of this thread.

In reply to Re^2: File input-output handle defined or no determination by Anonymous Monk
in thread File input-output handle defined or no determination by abdan

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