* Write, test VM.
-* Handling of read-only pages?
-
-* Test list, hash ADTs.
- - Finish comments for hash.[ch].
-
-* Compile and install gdb, dbg versions.
- - Test gdb version.
-
-* References/bibliography.
- - Userprog refers to [SysV-i386].
+* Finish comments for hash.[ch].
* Write "tour".