With the release of Windows 8.1 and the upcoming Windows Phone 8.1, Windows across devices works perfectly in sync in many ways. For example, you can start your web browsing on Windows PC and continue it by opening the same browser tabs on WP8.1 device. Even your theme color of phone and PCs gets synced along with WiFi passwords, favorites, etc,.
Your Microsoft Account allows Windows and Windows Phone to work together in amazing ways. Windows Phone 8.1 furthers the integration between phone and PC. If you change your theme color, that change will sync across all your Windows devices. If you buy an in-app purchase in some of the newer apps written for Windows Phone and Windows 8.1, the purchase works on your phone AND your PC. And other settings like your home Wi-Fi password will also sync.
And finally with Internet Explorer 11 for Windows Phone, you will be able to see all the open tabs you have on all your Windows devices and all your Favorites too. Plus the new Internet Explorer gives you InPrivate browsing, password caching, and a super-handy reading mode.