Auto sending text files from SCO box to a PC via serial cable

I have an SCO system with several PC's hooked up via ProComm and serial cabling (no Ethernet). I want to occasionally transfer a small text file from the UNIX system to a specific PC without the PC operator having to do anything (she may be out to lunch or doing other work during the transfer)

What is a UNIX command (or program) that might do this transfer? (I assume we can use cron to run this command or program every few minutes).

Graham Browne
Business Systems, Inc.
Jackson, MS
Phone: 601-957-1500