close_all_serials — This operator is inoperable. It had the following function:
Close all serial devices.
close_all_serials is obsolete, inoperable, and is only provided for
reasons of backward compatibility.
New applications should not use
the operator will be removed in future versions.
close_all_serials( : : : )
close_all_serials exists solely for the purpose of
implementing the “reset program” functionality in HDevelop.
close_all_serials must not be used in any
close_all_serials returns always 2 (H_MSG_TRUE).