Open url in the default web browser.
Editor Window that lets you load docs for any Selected GameObject.
    // EditorScript that quickly searchs for a help page
    // of the selected Object.
    //
    // If there is no page found on the Manual it opens the Unity forum.
    import UnityEditor;
    class QuickHelper extends EditorWindow {
        var source : Object;
        @MenuItem("Example/QuickHelper _h")
        static function Init() {
            var window : QuickHelper = EditorWindow.GetWindowWithRect(QuickHelper, Rect(0,0,165,100));
            window.Show();
        }
        function OnGUI() {
            EditorGUILayout.BeginHorizontal();
            source = EditorGUILayout.ObjectField(source, Object);
            EditorGUILayout.EndHorizontal();
            if(GUILayout.Button("Search!")) {
                if(source == null) {
                    this.ShowNotification(GUIContent("No object selected for searching"));
                } else {
                    if(Help.HasHelpForObject(source))
                        Help.ShowHelpForObject(source);
                    else
                        Help.BrowseURL("http://forum.unity3d.com/search.php");
                }
            }
        }
    }