Session
A session lets an allowed app spend up to a cap from your vault without asking your devices each time. The app holds its own session key. You set the cap, and you can revoke it at any moment.
Catalogue sessions
A vault holds up to eight sessions at once. Arming one waits. Then you settle it on Waiting, and that pays the cap. Revoke closes a session or frees its slot. Only apps your vault has allowed can be armed.
Gas is separate
Relay grants for gas are not sessions. They are opened on Fee and filled on Fund.
Where you see progress
After you approve an arm or a revoke, the activity dock shows its stages: signed, sent, included. A delayed action reads "Queued" with a link to Waiting.