Databases and other data stores which treat the integrity of data as paramount often include the ability to handle transactions to maintain the integrity of data. A single transaction consists of one or more independent units of work, each reading and/or writing information to a database or other data store.
I have a situation where I am writing to global from different processes - let's call it an Event Queue. There is then a different process that uses $order to read through the data - the PubSub processing BP.
Sometimes the writing of this global will form part of a transaction that also insert data into other tables, using tstart and tcommit. If there is some issue, it will roll back, and the entry written to the global will also roll back.
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