IF there's a key word for Apple's latest developer conference, it's continuity.
Apple exec Craig Federighi and CEO Tim Cook both mentioned it when running through the big innovations. First, a Mac and iPhone or iPad can talk to each other like never before.
AirDrop, Apple's home brewed system for sending files wirelessly and without a wi-fi network between Macs or between iOS devices will now do it between the two different platforms.
And if you're writing an email on your iPad and it turns out to be more detailed than you'd imagined, you can put down the tablet and switch seamlessly to the Mac to type on a more conducive piece of kit (aka a keyboard). We'll have to see how this plays out in use but the idea is tremendous.
Apple also did a lot of catching up. For instance typing on an iPhone, though good, was no match for the likes of Swiftkey, the impressive UK software company that has made text entry a doddle by predicting words before you type a single letter.
The iPhone now has this - and it promises to be superbly implemented, suggesting different vocabulary depending on who you're talking to. It knows you use different words when talking to your boss than to your lover.
Well, let's hope you do, anyway.
The new Handoff feature will let you pick up calls on your laptop using your phone.
Apple offered stuff similar to Dropbox with its iCloud Drive which will let you store lots of photos in the cloud for a low-ish monthly fee.
And even Snapchat has been honoured by imitation: you can add speech and video messages in what was previously a text message app and these will be default self-destruct.
As ever with Apple, it's not having the idea first that counts, but implementing it simply and seamlessly as well as making thinks look good in the process - there was much talk of screens that refreshed so smoothly they offered "buttery scrolling". Is it hyperbole? Well, yes, but we still like the end product.
And at last, at last, Apple offered third-party support for keyboards.
This may not sound much but Apple has always controlled the keyboard utterly. Now other companies can create better ways to type.
Since the new swipeable keyboard on Windows Phone is sensational, having something similar on Apple is great news.
Apple's new HealthKit app will act as a central hub for all users' health data - from wearables and other hardware.
Opening up access to home automation apps and health apps is also a big deal because of Apple's strong security concerns.
If you have the right home automation hardware, then just speaking the words "Night, night, house" into your phone can lock the door, turn off the lights and more. Cool, huh?
Touch ID - the fingerprint sensor on the iPhone 5s - is also opening up, so that it'll do more than just open the phone and pay for iTunes stuff. This could be a game changer as companies allow you to settle a bill with one tap.
WWDC doesn't announce the next iPhone and iPad hardware but the software reveals the future: Apple is describing the blank canvas on which the apps will work and the next generation of hardware will exploit.
This year's detailed announcements on features like a new programming language may not mean a great deal to most of us, but - judging by the whoops coming from the rows behind me - will dramatically change what the iPhone and iPad can do when the hardware arrives.
Since much of the joy of Apple gadgetry is driven by the ingenuity of app developers, this is potentially the most exciting development in Apple software for years.
Update your news preferences and get the latest news delivered to your inbox.