9. S1 S2 S3 (1,2) (2,1) Site S2 exitsCS and release message (1,2) (1,2),(2,1) (1,2),(2,1) (1,2),(2,1) S2 exits CS
10.
11.
12. Conclusion Though it does not explain the Modern scenario of distributed systems but , it gave the basic of developing the present way of handling distributed resources.