I accidentally typed the word Other (without quotes) when naming a Tab Control tab and was surprised to find that FileMaker 13 accepted it. In browse mode and in the Data Viewer, this mystery function resolves to the value 10 (in my solution). I have no such custom function or field name in my solution. Rather interesting. I know there are a few such undocumented reserved words in FM, but haven't started or seen a list lately.