Comment by Sanddancer

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's contact info would pull up the documents you were working on for them, etc. 20 years later, we still really don't have anything that can provide that sort of context on the desktop, or even worse, we don't have those kinds of relationships available for our phones.