description of the last demo spawnedand links pop up containing radio buttons that open local web browser on book-related sites when pressedthe info pop up displays simple message line and changes its font every second to draw attention to itselfsince this can be bit distractingthe pop up starts out iconified (click the info button to see or hide itthe links pop up' radio buttons are much like hyperlinks in web pagebut this gui isn' browserwhen the links pop up is pressedthe portable launch browser script mentioned in part ii is used to find and start web browser used to connect to the relevant siteassuming you have an internet connection this in turn uses python' webbrowser modules today the windows module we coded earlier in this (example - is used to give this gui' windows blue "pyiconinstead of the standard red "tk the pydemos gui also comes with "codebuttons to the right of each demo' buttonwhich open the source files that implement the associated example these files open in pop-up versions of the pyedit text editor that we'll meet in figure - captures some of these code viewer windows in actionresized slightly for display here for the web-based examples opened by the last two demo buttons in the launcherthis gui also attempts to spawn locally running web server for web-based demos not shown running here (we'll meet the server in for this editionthe web servers are spawned only when the corresponding web demo button is first selected (not on pydemos startup)and the web servers generate pop-up command prompt window on windows to monitor server status pydemos runs on windowsmacsand linuxbut that' largely due to the inherent portability of both python and tkinter for more detailsconsult the sourcewhich is shown in part in example - example - pp \pydemos pyw (external""###############################################################################pydemos pyw programming python nd rdand th editions (pp ) -- -- version ( )april ' updated to run under python xand spawn local web servers for web demos only on first demo button selection version ( )march ' add source-code file viewer buttonsadd new demos (pyphotopymailgui)spawn locally running web servers for the browser-based demosadd window iconsand probably more 've forgotten launch major python+tk gui examples from the bookin platform-neutral way this file also serves as an index to major program examplesthough many book gui coding techniques