diff --git a/assets/test_prelude.ld b/assets/test_prelude.ld
index 79a5fcd..3dc08a0 100644
--- a/assets/test_prelude.ld
+++ b/assets/test_prelude.ld
@@ -1241,14 +1241,22 @@ fn link! {
 	"Creates a 'hard link' between two processes: if either one dies, they both do."
 	(pid1 as :keyword, pid2 as :keyword) -> link! (pid1, pid2, :report)
 	(pid1 as :keyword, pid2 as :keyword, :report) -> base :process (:link_report, pid1, pid2)
-	(pid1 as :keyword, pid2 as :keyword, :panic) -> base :process (:link_panic, pid1, pid2)
+	(pid1 as :keyword, pid2 as :keyword, :enforce) -> base :process (:link_enforce, pid1, pid2)
 }
 
-fn msgs () -> base :process (:msgs)
+fn msgs {
+	"Returns the entire contents of the current process as a list. Leaves all messages in the process mailbox."
+	() -> base :process (:msgs)
+}
 
-fn flush! () -> base :process (:flush)
+fn flush! {
+	"Clears the current process's mailbox."
+	() -> base :process (:flush)}
 
-fn sleep! (ms as :number) -> base :process (:sleep, ms)
+fn sleep! {
+	"Puts the current process to sleep for at least the specified number of milliseconds."
+	(ms as :number) -> base :process (:sleep, ms)
+}
 
 #{
 	self
@@ -1256,8 +1264,11 @@ fn sleep! (ms as :number) -> base :process (:sleep, ms)
 	msgs
  	spawn!
 	yield!
+
 	alive?
 	link!
+	flush!
+	sleep!
 
 	abs
 	abs
diff --git a/src/vm.rs b/src/vm.rs
index add7909..f36c1ff 100644
--- a/src/vm.rs
+++ b/src/vm.rs
@@ -289,7 +289,7 @@ impl Creature {
                         .borrow_mut()
                         .send_msg(pid, args[2].clone());
                 }
-                self.push(Value::Nil);
+                self.push(Value::Keyword("ok"));
             }
             "spawn" => {
                 println!("spawning new process!");
@@ -300,8 +300,25 @@ impl Creature {
             }
             "yield" => {
                 self.r#yield = true;
-                self.push(Value::Nil);
+                self.push(Value::Keyword("ok"));
             }
+            "alive" => {
+                let Value::Keyword(pid) = args[1].clone() else {
+                    unreachable!();
+                };
+                let is_alive = self.zoo.as_ref().borrow().is_alive(pid);
+                if is_alive {
+                    self.push(Value::True)
+                } else {
+                    self.push(Value::False)
+                }
+            }
+            "link" => todo!(),
+            "flush" => {
+                self.mbx = VecDeque::new();
+                self.push(Value::Keyword("ok"));
+            }
+            "sleep" => {}
             msg => panic!("Process does not understand message: {msg}"),
         }
     }