Whether it is useful now is hard to say, but here is a comment from 2002 
that offers some insight:

offerViewerMenuFor: aViewer event: evt
     "Offer the primary Viewer menu to the user.  Copied up from Player 
code, but most of the functions suggested here don't work for non-Player 
objects, many aren't even defined, some relate to exploratory sw work 
not yet reflected in the current corpus.  We are early in the life cycle 
of this method..."


On 10/18/19 1:37 AM, Nicola Mingotti wrote:
> hi,
>
> here is a video explaining the question
>
> https://www.youtube.com/watch?v=n2wn9Yc7P2s&feature=youtu.be
>
>
> bye
> Nicola
>
>
>
>
>> On Oct 17, 2019, at 9:49 AM, karl ramberg <karlramberg at gmail.com 
>> <mailto:karlramberg at gmail.com>> wrote:
>>
>> Hi,
>> I dom't really understand what you ask here.
>> Could you send a screen shot or something ?
>>
>> Best,
>> Karl
>>
>>
>> On Thu, Oct 17, 2019 at 12:38 AM Nicola Mingotti <nmingotti at gmail.com 
>> <mailto:nmingotti at gmail.com>> wrote:
>>
>>
>>     Hi Marcel,
>>
>>     I understand more or less how to use the Viewer on Players.
>>
>>     Indeed, I was surprised when I saw that there is a Viewer for a
>>     Morph !
>>
>>     And I don't understand at all how this does fit into the big
>>     picture nor how to use it.
>>
>>     It would be very nice if I could drag out a line from the Viewer
>>     and keep a variable of the Morph under my eyes in the World, in a
>>     tile.
>>
>>     bye
>>     Nicola
>>
>>
>>
>>
>>
>>
>>
>>
>>>     On Oct 16, 2019, at 1:40 AM, Marcel Taeumel
>>>     <marcel.taeumel at hpi.de <mailto:marcel.taeumel at hpi.de>> wrote:
>>>
>>>     >  Is it normal that I don't see the variable value in the
>>>     Viewer window ?
>>>
>>>     I think you need to click on "viewer for player". Players can
>>>     have scripts, which are constructed from those tiles.
>>>
>>>     Best,
>>>     Marcel
>>>>
>>>>     Am 16.10.2019 00:14:23 schrieb Nicola Mingotti
>>>>     <nmingotti at gmail.com <mailto:nmingotti at gmail.com>>:
>>>>
>>>>
>>>>     Hi,
>>>>
>>>>     Please follow these steps:
>>>>
>>>>     1] Drag a RectangleMorph into the World
>>>>     2] Center click over it
>>>>     3] Select the wrench Halo icon (gray one)
>>>>     4] Select "Viewer for Morph"
>>>>
>>>>     I see a lot of properties which I usually control via the
>>>>     Workspace.
>>>>
>>>>     Let's focus on "Rectangl Center".
>>>>
>>>>     My questions are:
>>>>     -] Is it normal that I don't see the variable value in the
>>>>     Viewer window ?
>>>>     -] It would be extremely useful if I could just drag out the
>>>>     ViewrMorphLine for "RectangleMorphCenter" into the World . So I
>>>>     could always check (in this case) the center of a Morph.
>>>>     -] More in general, I don't understand how I can use all of
>>>>     these tiles, can anybody give me some hints ?
>>>>
>>>>     bye
>>>>
>>>>     Nicola Mingotti
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>
>>
>>
>
>

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