Contents
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 - Multiprocessor support
   - Processor ablities from CPUID
   - Task requirements in TSS
   - "Traveling" IRQ0 handler
 - Process Tree
   - Master process, aka "the thing like init"
   - Processes consist of a group of 1 or more threads
     - Threads are siblings
     - Timing determined by fractional part (byte)
   - Subprocesses are children
   - Protection levels
     - new process can have lower (numberically higher) or equal
       priviledge level;  New process can voluntarily lower
       (numerically raise) its priviledge level
     - Master is at ring 0
     - Shells prob. at ring 2
     - Apps prob. at ring 3
   - Users
     - Master started by root
     - A process's child process is run as the user the process
       is run at, except that a process run as root can have child
       processes run as any user;  A process run as root can also
       voluntarily change to a different user