A treeview control helps users navigate a large site because they can expand and collapse nodes to keep the view manageable. A good example is the Microsoft Developer Network Online Library. You can get a free treeview applet from Microsoft. The applet is bundled with the HTML Help Workshop. You can download the Help Workshop at http://msdn.microsoft.com/library/tools/htmlhelp/wkshp/htmlhelp.EXE. For details on using the control, check this page: http://msdn.microsoft.com/library/officedev/odeopg/deconworkingwithhtmlhelpjavaapplet.htm. For best performance, detect the browser and use the ActiveX version of the treeview control for visitors who use Internet Explorer and Windows.
When it launched in 2008, the Apple App Store only had 500 apps available. By the first quarter of 2022, the store had about 2.18 million iOS-exclusive apps. Average monthly app releases for the platform reached 34,000 in the first half of 2022, indicating rapid growth in iOS app development.