ZK - Difference Between @load,@save,@bind

Can someone please explain me the difference between @load,@save,@bind with an example, i have read about them but i got more confused about the basic difference between them. they all look and work in somewhat same manner.
what does it mean when i write something like below

<textbox value="@load(vm.address.streatName)"/>
<datebox value="@save(vm.trip.leaveDate)"/>
<label value="@bind(vm.name)"/>

thanks in advance

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ZK reference

ZK is a component-based UI framework that enables you to build Rich Internet Application (RIA) and mobile applications without having to learn JavaScript or AJAX. You can build highly-interactive and responsive AJAX web applications in pure Java. ZK provides hundreds of components^[1] which are designed for various purposes, some for displaying large amount of data and some for user input. We can easily create components in an XML-formatted language, ZUL.
All user actions on a page such as clicking and typing can be easily handled in a Controller. You can manipulate components to respond to users action in a Controller and the changes you made will reflect to browsers automatically. You don't need to care about communication details between browsers and servers, ZK will handle it for you. In addition to manipulating components directly i.e. MVC (Model-View-Controller) pattern ^[2], ZK also supports another design pattern, MVVM (Model-View-ViewModel) ^[3] which gives the Controller and View more separation. These two approaches are mutually interchangeable, and you can choose one of them upon your architectural consideration.

Architecture of ZK

Simple Architecture

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Introduction to Cascading Style Sheets

Cascading Style Sheets or CSS is the basic technique to separate the appearance of a web page from the content represented in HTML. In this section, we give an introduction to CSS and look how they are relevant to software development with Vaadin.

As we can only give a short intruction in this book, we encourage you to refer to the rich literature on CSS and the many resources available in the web. You can find the authoratitative specifications of CSS standards from the W3C website and other literature, references, and tutorials from the Open Directory Project page on CSS, as well as from other sources .

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Hello OSGi: Bundles for beginners & commands

OSGi = The Open Services Gateway Initiative defines an architecture for developing and deploying modular applications and libraries.

The Open Services Gateway Initiative (OSGi), also known as the Dynamic Module System for Java, defines an architecture for modular application development. OSGi container implementations such as Knopflerfish, Equinox, and Apache Felix allow you to break your application into multiple modules and thus more easily manage cross-dependencies between them.

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JavaFX 2 — The new Java desktop client run on web browser

What Is JavaFX?

The JavaFX platform is the evolution of the Java client platform designed to enable application developers to easily create and deploy rich internet applications (RIAs) that behave consistently across multiple platforms. Built on Java technology, the JavaFX platform provides a rich set of graphics and media API with high-performance hardware-accelerated graphics and media engines that simplify development of data-driven enterprise client applications.

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