diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -225,6 +225,10 @@
     'ConduitAPI_phragment_Method' => 'applications/phragment/conduit/ConduitAPI_phragment_Method.php',
     'ConduitAPI_phragment_getpatch_Method' => 'applications/phragment/conduit/ConduitAPI_phragment_getpatch_Method.php',
     'ConduitAPI_phragment_queryfragments_Method' => 'applications/phragment/conduit/ConduitAPI_phragment_queryfragments_Method.php',
+    'ConduitAPI_phrequent_Method' => 'applications/phrequent/conduit/ConduitAPI_phrequent_Method.php',
+    'ConduitAPI_phrequent_pop_Method' => 'applications/phrequent/conduit/ConduitAPI_phrequent_pop_Method.php',
+    'ConduitAPI_phrequent_push_Method' => 'applications/phrequent/conduit/ConduitAPI_phrequent_push_Method.php',
+    'ConduitAPI_phrequent_tracking_Method' => 'applications/phrequent/conduit/ConduitAPI_phrequent_tracking_Method.php',
     'ConduitAPI_phriction_Method' => 'applications/phriction/conduit/ConduitAPI_phriction_Method.php',
     'ConduitAPI_phriction_edit_Method' => 'applications/phriction/conduit/ConduitAPI_phriction_edit_Method.php',
     'ConduitAPI_phriction_history_Method' => 'applications/phriction/conduit/ConduitAPI_phriction_history_Method.php',
@@ -2547,6 +2551,7 @@
     'PhrequentTimeBlockTestCase' => 'applications/phrequent/storage/__tests__/PhrequentTimeBlockTestCase.php',
     'PhrequentTrackController' => 'applications/phrequent/controller/PhrequentTrackController.php',
     'PhrequentTrackableInterface' => 'applications/phrequent/interface/PhrequentTrackableInterface.php',
+    'PhrequentTrackingEditor' => 'applications/phrequent/editor/PhrequentTrackingEditor.php',
     'PhrequentUIEventListener' => 'applications/phrequent/event/PhrequentUIEventListener.php',
     'PhrequentUserTime' => 'applications/phrequent/storage/PhrequentUserTime.php',
     'PhrequentUserTimeQuery' => 'applications/phrequent/query/PhrequentUserTimeQuery.php',
@@ -2937,6 +2942,10 @@
     'ConduitAPI_phragment_Method' => 'ConduitAPIMethod',
     'ConduitAPI_phragment_getpatch_Method' => 'ConduitAPI_phragment_Method',
     'ConduitAPI_phragment_queryfragments_Method' => 'ConduitAPI_phragment_Method',
+    'ConduitAPI_phrequent_Method' => 'ConduitAPIMethod',
+    'ConduitAPI_phrequent_pop_Method' => 'ConduitAPI_phrequent_Method',
+    'ConduitAPI_phrequent_push_Method' => 'ConduitAPI_phrequent_Method',
+    'ConduitAPI_phrequent_tracking_Method' => 'ConduitAPI_phrequent_Method',
     'ConduitAPI_phriction_Method' => 'ConduitAPIMethod',
     'ConduitAPI_phriction_edit_Method' => 'ConduitAPI_phriction_Method',
     'ConduitAPI_phriction_history_Method' => 'ConduitAPI_phriction_Method',
@@ -5517,6 +5526,7 @@
     'PhrequentTimeBlock' => 'Phobject',
     'PhrequentTimeBlockTestCase' => 'PhabricatorTestCase',
     'PhrequentTrackController' => 'PhrequentController',
+    'PhrequentTrackingEditor' => 'PhabricatorEditor',
     'PhrequentUIEventListener' => 'PhabricatorEventListener',
     'PhrequentUserTime' =>
     array(
diff --git a/src/applications/phrequent/conduit/ConduitAPI_phrequent_Method.php b/src/applications/phrequent/conduit/ConduitAPI_phrequent_Method.php
new file mode 100644
--- /dev/null
+++ b/src/applications/phrequent/conduit/ConduitAPI_phrequent_Method.php
@@ -0,0 +1,11 @@
+<?php
+
+abstract class ConduitAPI_phrequent_Method extends ConduitAPIMethod {
+
+  public function getApplication() {
+    return PhabricatorApplication::getByClass(
+      'PhabricatorApplicationPhrequent');
+  }
+
+
+}
diff --git a/src/applications/phrequent/conduit/ConduitAPI_phrequent_pop_Method.php b/src/applications/phrequent/conduit/ConduitAPI_phrequent_pop_Method.php
new file mode 100644
--- /dev/null
+++ b/src/applications/phrequent/conduit/ConduitAPI_phrequent_pop_Method.php
@@ -0,0 +1,49 @@
+<?php
+
+final class ConduitAPI_phrequent_pop_Method
+  extends ConduitAPI_phrequent_Method {
+
+  public function getMethodDescription() {
+    return pht('Stop tracking time on an object by popping it from the stack.');
+  }
+
+  public function getMethodStatus() {
+    return self::METHOD_STATUS_UNSTABLE;
+  }
+
+  public function defineParamTypes() {
+    return array(
+      'objectPHID' => 'phid',
+      'stopTime' => 'int',
+      'note' => 'string'
+    );
+  }
+
+  public function defineReturnType() {
+    return 'phid';
+  }
+
+  public function defineErrorTypes() {
+    return array(
+    );
+  }
+
+  protected function execute(ConduitAPIRequest $request) {
+    $user = $request->getUser();
+    $object_phid = $request->getValue('objectPHID');
+    $timestamp = $request->getValue('stopTime');
+    $note = $request->getValue('note');
+    if ($timestamp === null) {
+      $timestamp = time();
+    }
+
+    $editor = new PhrequentTrackingEditor();
+
+    if (!$object_phid) {
+      return $editor->stopTrackingTop($user, $timestamp, $note);
+    } else {
+      return $editor->stopTracking($user, $object_phid, $timestamp, $note);
+    }
+  }
+
+}
diff --git a/src/applications/phrequent/conduit/ConduitAPI_phrequent_push_Method.php b/src/applications/phrequent/conduit/ConduitAPI_phrequent_push_Method.php
new file mode 100644
--- /dev/null
+++ b/src/applications/phrequent/conduit/ConduitAPI_phrequent_push_Method.php
@@ -0,0 +1,44 @@
+<?php
+
+final class ConduitAPI_phrequent_push_Method
+  extends ConduitAPI_phrequent_Method {
+
+  public function getMethodDescription() {
+    return pht(
+      'Start tracking time on an object by '.
+      'pushing it on the tracking stack.');
+  }
+
+  public function getMethodStatus() {
+    return self::METHOD_STATUS_UNSTABLE;
+  }
+
+  public function defineParamTypes() {
+    return array(
+      'objectPHID' => 'required phid',
+      'startTime' => 'int'
+    );
+  }
+
+  public function defineReturnType() {
+    return 'phid';
+  }
+
+  public function defineErrorTypes() {
+    return array(
+    );
+  }
+
+  protected function execute(ConduitAPIRequest $request) {
+    $user = $request->getUser();
+    $object_phid = $request->getValue('objectPHID');
+    $timestamp = $request->getValue('startTime');
+    if ($timestamp === null) {
+      $timestamp = time();
+    }
+
+    $editor = new PhrequentTrackingEditor();
+    return $editor->startTracking($user, $object_phid, $timestamp);
+  }
+
+}
diff --git a/src/applications/phrequent/conduit/ConduitAPI_phrequent_tracking_Method.php b/src/applications/phrequent/conduit/ConduitAPI_phrequent_tracking_Method.php
new file mode 100644
--- /dev/null
+++ b/src/applications/phrequent/conduit/ConduitAPI_phrequent_tracking_Method.php
@@ -0,0 +1,45 @@
+<?php
+
+final class ConduitAPI_phrequent_tracking_Method
+  extends ConduitAPI_phrequent_Method {
+
+  public function getMethodDescription() {
+    return pht(
+      'Returns current objects being tracked in Phrequent.');
+  }
+
+  public function getMethodStatus() {
+    return self::METHOD_STATUS_UNSTABLE;
+  }
+
+  public function defineParamTypes() {
+    return array();
+  }
+
+  public function defineReturnType() {
+    return 'array';
+  }
+
+  public function defineErrorTypes() {
+    return array(
+    );
+  }
+
+  protected function execute(ConduitAPIRequest $request) {
+    $user = $request->getUser();
+
+    $times = id(new PhrequentUserTimeQuery())
+      ->setViewer($user)
+      ->needPreemptingEvents(true)
+      ->withUserPHIDs(array($user->getPHID()))
+      ->execute();
+
+    $now = time();
+
+    $results = id(new PhrequentTimeBlock($times))
+      ->getCurrentWorkStack($now);
+
+    return array('data' => $results);
+  }
+
+}
diff --git a/src/applications/phrequent/controller/PhrequentTrackController.php b/src/applications/phrequent/controller/PhrequentTrackController.php
--- a/src/applications/phrequent/controller/PhrequentTrackController.php
+++ b/src/applications/phrequent/controller/PhrequentTrackController.php
@@ -14,6 +14,7 @@
   public function processRequest() {
     $request = $this->getRequest();
     $user = $request->getUser();
+    $editor = new PhrequentTrackingEditor();
 
     $phid = $this->phid;
     $handle = id(new PhabricatorHandleQuery())
@@ -61,9 +62,9 @@
 
       if (!$err) {
         if ($this->isStartingTracking()) {
-          $this->startTracking($user, $this->phid, $timestamp);
+          $editor->startTracking($user, $this->phid, $timestamp);
         } else if ($this->isStoppingTracking()) {
-          $this->stopTracking($user, $this->phid, $timestamp, $note);
+          $editor->stopTracking($user, $this->phid, $timestamp, $note);
         }
         return id(new AphrontRedirectResponse());
       }
@@ -108,39 +109,4 @@
   private function isStoppingTracking() {
     return $this->verb === 'stop';
   }
-
-  private function startTracking($user, $phid, $timestamp) {
-    $usertime = new PhrequentUserTime();
-    $usertime->setDateStarted($timestamp);
-    $usertime->setUserPHID($user->getPHID());
-    $usertime->setObjectPHID($phid);
-    $usertime->save();
-  }
-
-  private function stopTracking($user, $phid, $timestamp, $note) {
-    if (!PhrequentUserTimeQuery::isUserTrackingObject($user, $phid)) {
-      // Don't do anything, it's not being tracked.
-      return;
-    }
-
-    $usertime_dao = new PhrequentUserTime();
-    $conn = $usertime_dao->establishConnection('r');
-
-    queryfx(
-      $conn,
-      'UPDATE %T usertime '.
-      'SET usertime.dateEnded = %d, '.
-      'usertime.note = %s '.
-      'WHERE usertime.userPHID = %s '.
-      'AND usertime.objectPHID = %s '.
-      'AND usertime.dateEnded IS NULL '.
-      'ORDER BY usertime.dateStarted, usertime.id DESC '.
-      'LIMIT 1',
-      $usertime_dao->getTableName(),
-      $timestamp,
-      $note,
-      $user->getPHID(),
-      $phid);
-  }
-
 }
diff --git a/src/applications/phrequent/editor/PhrequentTrackingEditor.php b/src/applications/phrequent/editor/PhrequentTrackingEditor.php
new file mode 100644
--- /dev/null
+++ b/src/applications/phrequent/editor/PhrequentTrackingEditor.php
@@ -0,0 +1,70 @@
+<?php
+
+final class PhrequentTrackingEditor extends PhabricatorEditor {
+
+  public function startTracking(PhabricatorUser $user, $phid, $timestamp) {
+    $usertime = new PhrequentUserTime();
+    $usertime->setDateStarted($timestamp);
+    $usertime->setUserPHID($user->getPHID());
+    $usertime->setObjectPHID($phid);
+    $usertime->save();
+
+    return $phid;
+  }
+
+  public function stopTracking(
+    PhabricatorUser $user,
+    $phid,
+    $timestamp,
+    $note) {
+
+    if (!PhrequentUserTimeQuery::isUserTrackingObject($user, $phid)) {
+      // Don't do anything, it's not being tracked.
+      return null;
+    }
+
+    $usertime_dao = new PhrequentUserTime();
+    $conn = $usertime_dao->establishConnection('r');
+
+    queryfx(
+      $conn,
+      'UPDATE %T usertime '.
+      'SET usertime.dateEnded = %d, '.
+      'usertime.note = %s '.
+      'WHERE usertime.userPHID = %s '.
+      'AND usertime.objectPHID = %s '.
+      'AND usertime.dateEnded IS NULL '.
+      'ORDER BY usertime.dateStarted, usertime.id DESC '.
+      'LIMIT 1',
+      $usertime_dao->getTableName(),
+      $timestamp,
+      $note,
+      $user->getPHID(),
+      $phid);
+
+    return $phid;
+  }
+
+  public function stopTrackingTop(PhabricatorUser $user, $timestamp, $note) {
+    $times = id(new PhrequentUserTimeQuery())
+      ->setViewer($user)
+      ->withUserPHIDs(array($user->getPHID()))
+      ->withEnded(PhrequentUserTimeQuery::ENDED_NO)
+      ->setOrder(PhrequentUserTimeQuery::ORDER_STARTED_DESC)
+      ->execute();
+
+    if (count($times) === 0) {
+      // Nothing to stop tracking.
+      return null;
+    }
+
+    $current = head($times);
+
+    return $this->stopTracking(
+      $user,
+      $current->getObjectPHID(),
+      $timestamp,
+      $note);
+  }
+
+}
diff --git a/src/applications/phrequent/query/PhrequentSearchEngine.php b/src/applications/phrequent/query/PhrequentSearchEngine.php
--- a/src/applications/phrequent/query/PhrequentSearchEngine.php
+++ b/src/applications/phrequent/query/PhrequentSearchEngine.php
@@ -186,7 +186,7 @@
             $usertime->getUserPHID() === $viewer->getPHID()) {
           $item->addAction(
             id(new PHUIListItemView())
-              ->setIcon('fa-time-o')
+              ->setIcon('fa-stop')
               ->addSigil('phrequent-stop-tracking')
               ->setWorkflow(true)
               ->setRenderNameAsTooltip(true)
diff --git a/src/applications/phrequent/storage/PhrequentTimeBlock.php b/src/applications/phrequent/storage/PhrequentTimeBlock.php
--- a/src/applications/phrequent/storage/PhrequentTimeBlock.php
+++ b/src/applications/phrequent/storage/PhrequentTimeBlock.php
@@ -37,12 +37,12 @@
       $timeline = array();
       $timeline[] = array(
         'event' => $event,
-        'at' => $event->getDateStarted(),
+        'at' => (int)$event->getDateStarted(),
         'type' => 'start',
       );
       $timeline[] = array(
         'event' => $event,
-        'at' => nonempty($event->getDateEnded(), $now),
+        'at' => (int)nonempty($event->getDateEnded(), $now),
         'type' => 'end',
       );
 
@@ -54,12 +54,12 @@
         $same_object = ($preempt->getObjectPHID() == $base_phid);
         $timeline[] = array(
           'event' => $preempt,
-          'at' => $preempt->getDateStarted(),
+          'at' => (int)$preempt->getDateStarted(),
           'type' => $same_object ? 'start' : 'push',
         );
         $timeline[] = array(
           'event' => $preempt,
-          'at' => nonempty($preempt->getDateEnded(), $now),
+          'at' => (int)nonempty($preempt->getDateEnded(), $now),
           'type' => $same_object ? 'end' : 'pop',
         );
       }
@@ -185,6 +185,42 @@
     return $object_ranges;
   }
 
+  /**
+   * Returns the current list of work.
+   */
+  public function getCurrentWorkStack($now, $include_inactive = false) {
+    $ranges = $this->getObjectTimeRanges($now);
+
+    $results = array();
+    foreach ($ranges as $phid => $blocks) {
+      $total = 0;
+      foreach ($blocks as $block) {
+        $total += $block[1] - $block[0];
+      }
+
+      $type = 'inactive';
+      foreach ($blocks as $block) {
+        if ($block[1] === $now) {
+          if ($block[0] === $block[1]) {
+            $type = 'suspended';
+          } else {
+            $type = 'active';
+          }
+          break;
+        }
+      }
+
+      if ($include_inactive || $type !== 'inactive') {
+        $results[] = array(
+          'phid' => $phid,
+          'time' => $total,
+          'type' => $type);
+      }
+    }
+
+    return $results;
+  }
+
 
   /**
    * Merge a list of time ranges (pairs of `<start, end>` epochs) so that no