•Send usernames and passwords when only domains match - Check this box to send usernames and passwords when checking links for documents that have been opened from the web using a username and password and when the link being checked is to the same domain as the source document, regardless of the folder. If this box is not checked, then usernames and passwords will be sent only when both the domain and folder/path of the link being checked matches that of the source document. Checking this box may send usernames and passwords to more locations and may be less secure. This option also affects URL targets with usernames and passwords in the Batch Wizard. This option is not enabled by default.
•Automatically check links in the background - Check this box to constantly check unchecked links in the background while you work. The link checker will automatically go into action when you are working with a document that has had links extracted that have not yet been checked. If HTML Validator finds bad links in the document that you are working with, then a red square will appear before the Links tab to indicate that bad links have been found. If all links have been found to be good, then a green square will appear. This option is enabled by default.
For more information about link checking, please visit the Link Checking section in the Things You Should Know topic.