Which TypoScript content objects are executed again on every request, even on a cached page?

The suffix _INT stands for "internal, uncached": TYPO3 stores the page in the cache but leaves a placeholder where a USER_INT or COA_INT object sits. On every request only this part is calculated again and inserted, while the rest comes quickly from the cache. This suits content that differs per visitor, such as a shopping cart or a login form. USER and COA, by contrast, are the cached variants – their result is stored with the page and only regenerated after the cache has been cleared.