The OpenTemporaryFile() command creates and opens a temporary file. It returns a string that is the filename of the temporary file.  The name of the file is of the form , where each  is replaced with a random character.

The OpenTemporaryFile(prefix) command uses prefix as a template for the temporary file.  The name of the file is of the form  where each  is replaced with a random character.

The current implementation of OpenTemporaryFile is not secure.  Between generating the unique filename and creating the file, another process may be able to create a file with the same name. By doing so, the other process can read information from or write information into the file.

If no temporary file can be created, an exception is raised.