Cascade DataHub

Gamma: Version 4.0
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# XVIII. Cascade DataHub

Table of Contents
`add_exception_function`, `add_echo_function` -- assign functions for exceptions or echoes on a point.
`lock_point` -- locks or unlocks points.
`point_locked` -- indicates if a point is locked.
`point_nanoseconds` -- gives the nanoseconds from `point_seconds` that a point value changed.
`point_seconds` -- gives the time the point value changed.
`point_security` -- gives the security level of a point.
`read_existing_point`, `read_point` -- retrieve points.
`register_all_points` -- registers an application to receive exceptions for all points.
`register_exception` -- not yet documented.
`register_point`, `register_existing_point` -- register an application to receive exceptions for a single point.
`remove_echo_function` -- removes an echo function from a symbol.
`remove_exception_function` -- removes an exception function from a symbol.
`secure_point` -- alters the security level on a point.
`set_domain` -- sets the default domain for future calls.
`set_security` -- changes the security level for the current process.
`unregister_point` -- stops echo and exception message sending.
`when_echo_fns`, `when_exception_fns` -- indicate the functions for echos or exceptions on a point.
`write_existing_point`, `write_point` -- write point values.

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