TOCs are not anything ground breaking nor is it a new feature.

A TOC is simply a field and you can update any field by selecting it and pressing F9. The way you have inserted the TOC, you also have a Content Control around it with a frame and flags above it showing you can update it with a click. That Content Control makes it appear more special than it actually is - just select the whole TOC and press F9 to update it on any machine.

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Andrew Lockton
Chrysalis Design, Melbourne Australia