Need help understanding how ipv4 and ipv6 co-exist

I'm trying to understand something that happened in our network recently. Current, we're all ipv4 based, but a few machines here and there have ipv6 enabled by mistake. Everything has been working ok, but recently we had some dhcp issues. I'm trying to understand how exactly ipv6 and ipv4 work together.
Questions:
- if we have workstations with ipv6 enabled but no dhcpv6 servers, does the ff02::1:2 multicast address exist on the network? If something starts up a dhcpv6 server somewhere, would that explain why several workstations have started sending out dhcpv6 solicit messages?
- If workstations attempt to get an address via dhcpv6 and get no response, will it try dhcp with ipv4, or will it just assign a 169.254.*.* address?

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Here is a short blurb from the BC / FAQ:
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find out more here: http://www.adobe.com/products/business-catalyst/faq.html

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