Crossties. It was a relational desktop for Windows 3.1 which could replace progman and allow you to set up associations with projects, contacts, etc -- for example, opening up someone&#x27;s contact info would pull up the documents you were working on for them, etc. 20 years later, we still really don&#x27;t have anything that can provide that sort of context on the desktop, or even worse, we don&#x27;t have those kinds of relationships available for our phones.