-Open the temporary file (strName is the name of file to be replaced), returns
-TRUE on success, FALSE if an error occurred.
+Open the temporary file, returns {\tt TRUE} on success, {\tt FALSE} if an error
+occurred.
+
+{\it strName} is the name of file to be replaced. The temporary file is always
+created in the directory where {\it strName} is. In particular, if
+{\it strName} doesn't include the path, it is created in the current directory
+and the program should have write access to it for the function to succeed.