Notes for this directory:

The main files are

	stm.h,  stm.c
        sos.h,  sos.c
        Makefile

You can type "make sos" to make the sos program.

This sos already has the improved I/O traps
(supporting string I/O).  
This sos can be tested using the following stm programs:

	hello.stm
	echo.stm
	dump.stm

Note: dump is another trap to dump the memory, which is
not required.

In hw5, which asks you to implement synchronization.
The original files,
	gcd.stm, primes.stm, fraction.stm, sort.stm
must be modified for SOS2.  We have already modified fraction.stm
to "fraction2.stm" for SOS2.