As a mail message traverses BITNET, progress messages are sent back to the message's originator and broadcast on their terminal. These messages can be suppressed by applying the nolocaluser keyword to the bit_ channels. This is best done with the CHANNEL_KEYWORD_OPTIONS symbol in the bitnet_domains_driver.com procedure as described in Section 3.8. See Section 2.2 for details on and implications of the nolocaluser keyword.