Inside TYPO3
| < 3.9.2. The locallang files for CSH | Table Of Content | 3.9.4. Implementing CSH for your own tables/fields > |
3.9.3. The CSH pop-up window
Apart from $TCA_DESCR labels (for example "description") shown directly in the context of a form or a module you can always click the little "?" icon:

This window will show you all details including possible links to related descriptions and external URLs.
In this window you can also click a link to see the full description of the whole table/module from which this single field stems: