# gcbo

Handle of the object whose callback is executing.

## Calling Sequence

                gcbo

## Description

`gcbo` is a Scilab variable automatically created each time a callback in executed. This variable is initialised using getcallbackobject.

`gcbo` does not exists in Scilab environment if no callback is currently executed.

You can use `gcbo` in callback functions particularly if you write a single callback function for multiple objects, it helps you to know which object received a user action.

## See Also

- getcallbackobject