diff --git a/user/app1/appl.cc b/user/app1/appl.cc
index 139e207..71e4754 100644
--- a/user/app1/appl.cc
+++ b/user/app1/appl.cc
@@ -6,25 +6,25 @@ char sbuf[8194], rbuf[8194]; // (2 * 4KiB) + 2
 void main() {
     fork();
     fork();
-    int other = fork();
     int ppid = sys_getpid();
-    write(1, "app", 3, 0, ppid);
-    //if (ppid == other) { // child
-    //    sbuf[0] = 3;
-    //    sbuf[8192] = sys_getpid();
-    //    sbuf[8193] = 1;
-    //    send(other, sbuf, 8193, rbuf, 8193);
+    int other = fork();
+    //write(1, "app", 3, 0, ppid);
+    if (ppid == other) { // child
+        sbuf[0] = 3;
+        sbuf[8192] = sys_getpid();
+        sbuf[8193] = 1;
+        send(other, sbuf, 8193, rbuf, 8193);
  
-    //    char msg[] = "REPLY: AA\n";
-    //    msg[7] += rbuf[0] + sbuf[8193];
-    //    msg[8] += 4 + ppid;
-    //    write(0, msg, 10);
-    //} else { // parent
-    //    receive(rbuf, 8193);
-    //    rbuf[0] = rbuf[0] + rbuf[8192];
-    //    rbuf[8193] = 7;
-    //    reply(rbuf, 8193);
-    //}
+        char msg[] = "REPLY: AA\n";
+        msg[7] += rbuf[0] + sbuf[8193];
+        msg[8] += 4 + ppid;
+        write(0, msg, 10,0, ppid);
+    } else { // parent
+        receive(rbuf, 8193);
+        rbuf[0] = rbuf[0] + rbuf[8192];
+        rbuf[8193] = 7;
+        reply(rbuf, 8193);
+    }
  
     sys_exit();
 }