If we have a usemame “ralph”, then we should have a “home directory” (in Unix terms) on an ACAP server called /byowner/user/ralph. In ACAP’s weird and wonderful aliasing, this directory would also be accessible as /user/ralph or, if we logged in as ralph, /~.

If we wish to create a new dataset to hold an address book, we might call it /byowner/user/ralph/addressbook, which we could access as /addressbook/user/ralph. We will use this example throughout the rest of this chapter.