Hi, I haven't needed to use diacriticical marks but the book says you can use them. It just doesn't say how. Perhaps you need to go to preferences and temporarily change your font to one that will give you the umlaut or whatever you need and then try KeyCaps. This sounds like a good question for the PAF users list which just started. <Here's the subscribing info.: <I have two new mailing list for PAF users. If you are using either Version 2.31 or 3, you can subscribe by sending the word subscribe to either: PAF-2.31-USERS-L-request@rootsweb.com or PAF-2.31-USERS-D-request@rootsweb.com for digest version. or PAF-3-USERS-L-request@rootsweb.com or PAF-3-USERS-D-request@rootsweb.com for digest version.> Edith You wrote <When doing data entry on the PAF 2.3 for MAC, how does one put in diacritical markings like umlauts? The Key Cap technique used for data processing does not work.>