APS databases can be quite large. Some of them contain millions of documents. This amount of data requires a very sophisticated search technology so that users will find what they are looking for. In APS, all data fields are searchable and you can choose which fields – if not all the fields - you would like to search. Upon starting to type the query, you will see instant suggestions to complete the search.
The search itself is performed on an index of your collection database, not on the actual documents. You are then able to order the search results or refine the search. Searches can be saved, which makes sense when you have to perform the same search several times. You will also see a list of your previous searches, which is another very convenient feature.