# `dependents`

The `observer` and `subject` categories implement the Smalltalk dependents handling mechanism. This mechanism can be used as an alternative to Logtalk system-wide support for event-driven programming.

## API documentation

Open the ../../apis/library_index.html#dependents link in a web browser.

## Loading

To load all entities in this library, load the `loader.lgt` utility file:

    | ?- logtalk_load(dependents(loader)).