diff --git a/common/rfb/ScreenSet.h b/common/rfb/ScreenSet.h
new file mode 100644
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+++ b/common/rfb/ScreenSet.h
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+/* Copyright 2009 Pierre Ossman for Cendio AB
+ * 
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+
+// Management class for the RFB virtual screens
+
+#ifndef __RFB_SCREENSET_INCLUDED__
+#define __RFB_SCREENSET_INCLUDED__
+
+#include <rfb/Rect.h>
+#include <list>
+#include <set>
+
+namespace rfb {
+
+  // rfb::Screen
+  //
+  // Represents a single RFB virtual screen, which includes
+  // coordinates, an id and flags.
+
+  struct Screen {
+    Screen(void) : id(0), flags(0) {};
+    Screen(rdr::U32 id_, int x_, int y_, int w_, int h_, rdr::U32 flags_) :
+      id(id_), dimensions(x_, y_, x_+w_, y_+h_), flags(flags_) {};
+    rdr::U32 id;
+    Rect dimensions;
+    rdr::U32 flags;
+  };
+
+  // rfb::ScreenSet
+  //
+  // Represents a complete screen configuration, excluding framebuffer
+  // dimensions.
+
+  struct ScreenSet {
+    ScreenSet(void) {};
+    inline void add_screen(const Screen screen) { screens.push_back(screen); };
+    inline bool validate(int fb_width, int fb_height) const {
+      std::list<Screen>::const_iterator iter;
+      std::set<rdr::U32> seen_ids;
+      Rect fb_rect;
+
+      if (screens.empty())
+        return false;
+
+      fb_rect.setXYWH(0, 0, fb_width, fb_height);
+
+      for (iter = screens.begin();iter != screens.end();++iter) {
+        if (iter->dimensions.is_empty())
+          return false;
+        if (!iter->dimensions.enclosed_by(fb_rect))
+          return false;
+        if (seen_ids.find(iter->id) != seen_ids.end())
+          return false;
+        seen_ids.insert(iter->id);
+      }
+
+      return true;
+    };
+    std::list<Screen> screens;
+  };
+
+};
+
+#endif
+