diff --git a/js-assembler/runtime-src/baselib-contmarks.js b/js-assembler/runtime-src/baselib-contmarks.js
index 696d88c..9a81a43 100644
--- a/js-assembler/runtime-src/baselib-contmarks.js
+++ b/js-assembler/runtime-src/baselib-contmarks.js
@@ -1,5 +1,5 @@
 /*global plt*/
-/*jslint browser: true, unparam: true, vars: true, white: true, maxerr: 50, indent: 4 */
+/*jslint browser: true, unparam: true, vars: true, white: true, maxerr: 50, indent: 4 , plusplus: true */
 
 // Continuation marks
 (function(baselib) {
@@ -71,21 +71,33 @@
         return result;
     };
 
+    var isContinuationMarkSet = baselib.makeClassPredicate(ContinuationMarkSet);
 
 
 
 
     // A continuation prompt tag labels a prompt frame.
     var ContinuationPromptTag = function(name) {
-	this.name = name;
+	this.name = name;         // String
+
     };
 
+    var isContinuationPromptTag = baselib.makeClassPredicate(ContinuationPromptTag);
+
+
+
+    var DEFAULT_CONTINUATION_PROMPT_TAG =
+        new ContinuationPromptTag("default-continuation-prompt-tag");
 
 
 
 
 
     exports.ContinuationMarkSet = ContinuationMarkSet;
+    exports.isContinuationMarkSet = isContinuationMarkSet;
     exports.ContinuationPromptTag = ContinuationPromptTag;
+    exports.isContinuationPromptTag = isContinuationPromptTag;
+    exports.DEFAULT_CONTINUATION_PROMPT_TAG = DEFAULT_CONTINUATION_PROMPT_TAG;
+
 
 }(this.plt.baselib));
\ No newline at end of file
diff --git a/js-assembler/runtime-src/baselib-primitives.js b/js-assembler/runtime-src/baselib-primitives.js
index 6a7cb09..5f1df65 100644
--- a/js-assembler/runtime-src/baselib-primitives.js
+++ b/js-assembler/runtime-src/baselib-primitives.js
@@ -2058,6 +2058,7 @@
             return baselib.srclocs.srclocColumn(checkSrcloc(M, 'srcloc-column', 0));
         });
 
+
     installPrimitiveProcedure(
         'srcloc-position',
         1,
@@ -2065,6 +2066,7 @@
             return baselib.srclocs.srclocPosition(checkSrcloc(M, 'srcloc-position', 0));
         });
 
+
     installPrimitiveProcedure(
         'srcloc-span',
         1,
@@ -2072,6 +2074,37 @@
             return baselib.srclocs.srclocSpan(checkSrcloc(M, 'srcloc-span', 0));
         });
 
+
+
+    installPrimitiveProcedure(
+        'make-continuation-prompt-tag',
+        makeList(0, 1),
+        function(M) {
+            var sym;
+            if (M.a === 1) {
+                sym = checkSymbol(M, "make-continuation-prompt-tag", 0);
+                return new baselib.contmarks.ContinuationPromptTag(sym.toString());
+            }
+            return new baselib.contmarks.ContinuationPromptTag(undefined);
+        });
+
+    installPrimitiveProcedure(
+        'continuation-prompt-tag?',
+        1,
+        function(M) {
+            return baselib.contmarks.isContinuationPromptTag(M.e[M.e.length - 1]);
+        });
+
+
+
+    installPrimitiveProcedure(
+        'default-continuation-prompt-tag',
+        0,
+        function(M) {
+            return baselib.contmarks.DEFAULT_CONTINUATION_PROMPT_TAG;
+        });
+
+
     exports['Primitives'] = Primitives;
     exports['installPrimitiveProcedure'] = installPrimitiveProcedure; 
     exports['installPrimitiveClosure'] = installPrimitiveClosure; 
diff --git a/js-assembler/runtime-src/runtime.js b/js-assembler/runtime-src/runtime.js
index 0464715..3a9fd80 100644
--- a/js-assembler/runtime-src/runtime.js
+++ b/js-assembler/runtime-src/runtime.js
@@ -565,8 +565,8 @@
 
     // There is a single, distinguished default continuation prompt tag
     // that's used to wrap around toplevel prompts.
-    var DEFAULT_CONTINUATION_PROMPT_TAG = 
-	new ContinuationPromptTag("default-continuation-prompt-tag");
+    var DEFAULT_CONTINUATION_PROMPT_TAG =
+        baselib.contmarks.DEFAULT_CONTINUATION_PROMPT_TAG;
 
 
 
diff --git a/lang/kernel.rkt b/lang/kernel.rkt
index e7fa65b..ab5c85e 100644
--- a/lang/kernel.rkt
+++ b/lang/kernel.rkt
@@ -449,14 +449,16 @@ char=?
   char-upcase
   char-downcase
 
- 
-;;  call-with-current-continuation
+  
+  ;; these are defined in bootstrapped-primitives in Whalesong's compiler package
+  call-with-current-continuation
   call/cc
-;;  call-with-continuation-prompt
-;;  abort-current-continuation
-;;  default-continuation-prompt-tag
-;;  make-continuation-prompt-tag
-;;  continuation-prompt-tag?
+
+  ;;  call-with-continuation-prompt
+  ;;  abort-current-continuation
+  default-continuation-prompt-tag
+  make-continuation-prompt-tag
+  continuation-prompt-tag?
 
   make-reader-graph
   make-placeholder