Microsoft IntelliSense provides an array of options that make language references easily accessible. When coding, you do not need to leave the editor to perform searches on language elements. You can keep your context, find the information you need, insert language elements directly into your code, and even have IntelliSense complete your typing for you.
Quick Info (IntelliSense) (Only available in the XML editor)
Enabling IntelliSense for large Transact-SQL scripts can reduce the performance of slow computers. For information about how to limit the size of Transact-SQL scripts for which IntelliSense is enabled, see Options (Text Editor/Transact-SQL/IntelliSense).