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-Hi. In this video, we are going to look
at the class counterpart

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of the implementors
and senders functionalities.

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So, let's open
the System Browser once more.

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So, Tools, System Browser,
go to AST-Core,

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RBComment, for example,
or any other class.

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You can right click on the class
and go to the Class references.

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You can see that it even has
the same shortcut as the senders.

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So, click on that.

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You will have all the references
to the RBComment

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that are made in bodies of methods
in the system.

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Right there, we have four of them.

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You can investigate them,
as with implementors and senders,

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and another thing
is that this functionality is so useful

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that it has
its own button in the interface.

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So, right here, you can click on it
to open the same references.

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Another important thing is,
when looking at instance variables,

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you can highlight them.

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Right click, go to Code search.

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This will help you have access
to senders and implementors as well,

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but most importantly,
to References to it.

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If we look at it, there are basically

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all the references
to the instance variable contents.

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This will really help you understand

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how the instance variable
is used within the class.

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So, those functionalities
coupled with the ones of the methods

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will really help you understand classes,

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their architectures
and how they work together,

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with the instance variables,
how they are sent,

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and you can look for examples,
which is really important.

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You can look for examples
using the senders functionality.

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So, they have the same shortcut,
Cmd+N, to look at the references.

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Or you can click on Class refs.

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And if you want to look
for the references to instance variable,

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Shift+Cmd+N
will open References to left.