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When an Info Item is created, it is linked to one other Info Item (its parent). Deleting it (via hitting the Delete key or Edit | Delete from the menu) will delete it to the Recycle Bin. Deleting it while holding the Shift key will permanently delete it (not moved to the Recycle Bin but immediately removed).
If an Info Item is created, then linked to a second "parent" Info Item, it now has two parents (but only exists once). This is what is defined as Logical Linking, which allows you to relate Info Items together in multiple ways but without redundant copies of the same information. Each "instance" of the multi-linked Info Item functions will have a "linked" icon overlay and will have the same children in every location in the Data Explorer.
If you delete one "instance" of a multi-linked Info Item, this link will be re-parented to the Recycle Bin. If you permanently delete (using Shift+Delete) the "instance" then this link to the Info Item is permanently deleted, similar to the above singly linked example. If the remaining "instance" of the Info Item now only has one parent, then the icon overlay is removed and again a regular singly-linked Info Item.
As mentioned earlier by kinook, if you use Ctrl+Shift+Del, then all "instances" of the Info Item (and all its children) will be permanently deleted from the Info Database.
Note: even permanent deletions can be undone with Undo until the Ultra Recall application is closed.
I know that is a long answer to a short question, I hope the response clarifies how Logical Linking works and how you un-link an Info Item.
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