unregister_point

Gamma: Version 4.0
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# `unregister_point`

`unregister_point` -- stops echo and exception message sending.

## Syntax

    unregister_point (symbol)

## Arguments

`symbol`

  The point to unregister.

## Returns

t on success, or nil on failure.

## Description

This function causes the Cascade DataHub to immediately stop sending echo and exception messages for the named point. It is possible that exceptions and echos which are queued to the task will arrive after this function is called, but the datahub will not generate any new messages.

## Example

        Gamma> register_all_points(nil,t);
        t
        Gamma> b;
        55
        Gamma> unregister_point(#b);
        t
        Gamma> write_point(#b,33);
        t
        Gamma> write_point(#c,77);
        t
        Gamma> next_event();
        nil
        Gamma> b;
        55
        Gamma> c;
        77
        Gamma>

## See Also

`register_point`, `register_all_points`

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