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+# $EPIC: isfilevalid.txt,v 1.2 2007/02/15 03:53:35 jnelson Exp $
+======Synopsis:======
+$[[isfilevalid]](//file descriptor//)
+======Description:======
+This function returns true if the //file descriptor// was previously
+returned by the [[open]] function and has not yet been passed to the
+[[close]] function, and false otherwise.
+This will tell you whether or not it possible to [[read]] or [[write]]
+to a file.
+======Returns:======
+<file>
+   The file descriptor is valid and can be used.
+   The file descriptor is not valid and cannot be used
+</file>
+======History:======
+This function first appeared in EPIC4-1.1.6.