--- a/progs/README	Mon Oct 05 12:47:56 2015 +0100
+++ b/progs/README	Mon Oct 05 20:42:11 2015 +0100
@@ -4,8 +4,63 @@
 
 The programs are under 
 
-  cu$> test/app-material/progs
+  cu$> app-material/progs
+
+
+Programs can be updated using
+
+  hg pull
+  hg update
+  hg revert --all
+
+Emacs can be used to edit files
+
+  emacs -nw ...file....     (is also an alias)
+
+
+C0.c
+====
+
+Add the bigger string and the long is printed out differently.
+
+C1.c
+====
+
+needs to be called using
+
+  ./C1 `args1-good`
+  ./C1 `args1-bad`
+
+or in gdb using
 
+  gdb --args ./C1 `args1-bad`
+
+
+C2.c
+====
+
+called with
+  
+  ./args2-good | ./C2
+  ./args2-bad  | ./C2
+
+C3.c
+====
+(shell injection)
+
+called with 
+
+  ./C3
+
+opens a new shell
+
+
+C4.c
+====
+Format string attack
+
+  ./C4 "%s"
+  ./C4 `./args4`