What it does: When Rank Forge is active the target keyword is copied into its focus-keyword field; when Lang Forge is active a translation can be fired for the new post. Both are no-ops when the sibling is not installed. Notes:

• The Rank Forge handoff is free and makes no API call.
• The Lang Forge handoff is an opt-in checkbox on Settings, off until you tick it, and it does not appear at all when Lang Forge is absent. It queues one machine translation per extra language and Lang Forge charges about 3 credits for each — which is why it is a tick and not a default.