What this means is that if you type in part of a name and click on the Tab or Enter key, the system will finish filling out the name for you (Auto Complete). However, when there is more than one match or if there is no match in the system for the name you typed in, then you will see a squiggly colored line under the name (Text control with context sensitive hints).
Below are examples of text control with context sensitive hints and how to use these hints.