What is the difference between topic sessions and query sessions? How are they scheduled?

What is the difference between topic sessions and query sessions? How are they scheduled?

The topic sessions, e.g. Xero Banking Onsite and MYOB Set up Remote, are sessions about a specific topic in software. Only that topic will be covered during the session. The topic-wise sessions are rotated fortnightly.

The Query sessions can cover any topic of that software. The query sessions are usually run every day.