Prevent mutually recursive execution of triggers?

Question

Suppose you have the tables Presentations and Events. When a presentation is saved and contains basic event information, such as location and date, an

Answer 1

I'm not sure about doing it per transaction, but do you need nested triggers switched on for other parts? If you switch them off on the server then a trigger won't fire from another trigger updating a table.

EDIT (answer from the comments): You will need to alter trigger A to use TRIGGER_NESTLEVEL