• web pages for usp and its programs
• exer1 : summing the arguments
• exer2 : building the process tree
• exer3 : building the process tree and waiting
• exer4 : a simple `cat'
• exer5 : building the process tree connected with pipes
• exer6 : a simple `which'
• exer7 : a barrier implemented in fifo
• exer8 : print label in preorder, exercising with signal handler
• exer9 : asynchrous write