diff --git a/code/test/forkexec.c b/code/test/forkexec.c
new file mode 100644
index 0000000..084606b
--- /dev/null
+++ b/code/test/forkexec.c
@@ -0,0 +1,8 @@
+#include "syscall.h"
+main()
+{
+    ForkExec("../test/userpages0");
+    ForkExec("../test/userpages0");
+    while(1);
+}
+
diff --git a/code/test/userpages0 b/code/test/userpages0
deleted file mode 100644
index ce0fec1..0000000
Binary files a/code/test/userpages0 and /dev/null differ
diff --git a/code/test/userpages0.c b/code/test/userpages0.c
new file mode 100644
index 0000000..c004642
--- /dev/null
+++ b/code/test/userpages0.c
@@ -0,0 +1,20 @@
+#include "syscall.h"
+
+void output(char* s) {
+	int nb = 10;
+	int i;
+	for(i=0;i<nb;i++)
+		PutString((char*)s);
+    ThreadExit();
+}
+
+int main () {
+
+    // Premier Thread
+    void* f = output;
+
+    ThreadCreate(f,"a");
+    ThreadCreate(f,"b");
+    PutString("\nthis is the end of our main() in test program\n");
+    ThreadExit();   
+}