Infoprint XT passes data to the transform input application exit by using streams, and the application exit passes data back to Infoprint XT. The streams are:

fd0 (STDIN)

Infoprint XT uses standard input to pass the original Xerox job to the transform input application exit.

fd1 (STDOUT)

The transform input application exit must use standard output to pass the Xerox job back to Infoprint XT. The Xerox job can be in its original format, or it might contain modifications that the application exit made. The function of the transform input application exit determines the format.

fd2 (STDERR)

Infoprint XT captures anything that is written to standard error. Infoprint XT writes the information from standard error to the aioxlxie.lst file in the working directory for the job. If the conversion process fails to produce AFP output, Infoprint XT includes the standard error information on the error sheet for the job.