Is it possible to create a "virtual" copy of an object in illustrator?

In other words, lets say that I've got an object (that might be a simple object like a square, or a complicated group, or anything).
I can select the object, copy it and then paste it at some other location, but now it is a separate object.
What I'd like to do is make a "virtual" copy of the object, so that if any modifications are done to one of the copies, they are also done to the other copy. I.e., if I change the color of one sub-object in one of the virtual copies, the color also changes in the corresponding sub-object of the other virtual copy.
Note that this is similar to lightrooms virtual copy feature of images, but in that case, the modifications are separate even though the underlying image stayes the same. What I'm asking about here is for the ability to "link" objects together.
BTW, the basic reason I want this is for the following reason: I want to have an object occur in more than one artboard, but if I modify the object in one artboard, I'd like it to also be modified in the second artboard. It is not feasible to have the artboards overlap over *just* the object that I need (as that would in some sense solve the problem, and in fact does solve the problem in some limited circumstances, but not all of them, namely those where the two arboards need to have other also objects along with the common object that do not overlap).
thanks!

Just an addition, jb (unless this has changed in the latest version(s)):
If you want the option to position/align them by anything but the centre of the appearance (including effetcs), you may add a nostroke/nofill rectange/circle centred over the centre of the artwork and extending past its appearance in all directions.

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Hi Matt,
Yeah, I have some good news and some bad news:
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I can't reproduce this problem. It works fine here.
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See here for where to find the Preference file for your OS: http://helpx.adobe.com/lightroom/kb/preference-file-locations-lightroo m-4.html
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How do you remember why you created a virtual copy?

Virtual copies are really usefull but I'm already starting to struggle to remember why I created them (is this a senior moment...)
I look in a folder where I've created various virtual copies for different crop sizes, exposures, toning etc. The trouble is this isn't always obvous and I find myself having to look at each image it turn and working out why it's here.
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In Metadata you could note something under Workflow.
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Hi,
I am doing a project which requires using 2 existing softwares:
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Obviously, the 2 softwares can be installed in the same PC.
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Totti,
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enter commandshiftg in finder and in the resulting popup enter /Volumes
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Is it possible to create a "virtual" copy of an object in illustrator?

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