Rezz the object while wearing the group tag that youd like to obtain the UUID key from and then simply touch it to receive the key. A dialog will display as such: whispers: This object's Group Key is: "the group key"
Tip:
You can also edit the group in the objects details under the General tab to find the key of a group not currently active on your Avi. This is automatically set to whatever you have active when rezzed.
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