HP 9000 Installation And Configuration Manual page 22

ACC Overview
ACC Software
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The ACC Base Software product supplies the protocol modules that can
be used to verify that the product and the mux panel are installed and
functional, and that can be used to sense failures between the mux card
and the host system. These include a loopback, "NULL", and monitoring
protocol module.
Other protocol modules are available by ordering the ACC Protocols for
Application Developers product. These protocols may be accessed via the
low level ZCOM programmatic interface. The ACC Programmer's
Reference Guide describes this interface.
Other optional ACC protocol products, such as the ACC X.25/9000 Link
Software, include a ZCOM protocol module plus additional driver
software, utilities, and programmatic interface related software. These
protocol products provide industry standard programmatic interfaces
and services that are not accessible via the low level ZCOM
programmatic interface.
Chapter 1