-* 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].
-
* Write "tour".
+* Using PAL_USER.
+
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* Cygwin support: