Index: print.module
===================================================================
--- print.module	(revision 5979)
+++ print.module	(working copy)
@@ -862,3 +862,23 @@
 
   return implode('&', $params);
 }
+
+/**
+ * Pseudo-singleton. Set or check if the page is being printed.
+ *
+ * param bool @print
+ *    Value the singleton to be set to.
+ *
+ * return bool
+ *     Value the singleton was last set to.
+ */
+function print_printing($print = 0) {
+  static $printing;
+  if (!isset($printing) && $print === 0) {
+    $printing = FALSE;
+  }
+  else if (!isset($printing) || is_bool($print)) {
+    $printing = $print;
+  }
+  return $printing;
+}
Index: print.pages.inc
===================================================================
--- print.pages.inc	(revision 5979)
+++ print.pages.inc	(working copy)
@@ -626,6 +626,7 @@
   $path = drupal_get_normal_path($path);
 
   menu_set_active_item($path);
+  print_printing(TRUE);
   // Adapted from index.php.
   $node = new stdClass();
   $node->body = menu_execute_active_handler($path);