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from 64 Kbytes to 2 Mbytes. Many vendors achieve these small sizes by providing
simplified interfaces and by eliminating much of the desktop browser's multimedia
functionality such as streaming-audio and -video support.
Microbrowsers take one of the following two general approaches to accessing web
1. Direct Access Approach. The microbrowsers based on this approach use an
HTML-based language, such as compact HTML and XHTML. Compact HTML,
an HTML subset, works with small devices' resource limitations by not
supporting, for example, JPEG images, tables, multiple fonts, or more than two
colors. XHTML is basically HTML reformulated as an XML application. XHTML lets a small device access just a subset of a web page for easier downloading and
As shown in Figure 18.5(a), in case of microbrowsers that use this approach,
clients get data directly from a web server without any intervention. However, this
approach is limited by the server's ability to send information in HTML.
A few microbrowsers that use this approach are Microsoft's Mobile Explorer, the
Opera browser, and Pumatech's Browse-it.
WAP Gateway Approach. The microbrowers based on this approach use
WAP's Wireless Markup Language (WML). As shown in Figure 18.5(b), in this
approach a content-adaptation server, known as WAP gateway, is used. The data
downloaded from a web server first goes to the WAP gateway.
The WAP gateway translates the web content written in HTML or other languages
into WAP' WML. Thus the WAP gateway, which acts as a proxy, translates and
formats the web content i WML for the target hand-held device.
A few microbrowsers that use this approach are Neomar Microbrowser and the
Openwave Mobil Browser.
Next Generation Internet Protocol (IPV6)
The Internet connects together several hundred thousands of networks, and several
tens of millions of computers. Several millions of users access the Internet from
over more than hundred countries. The size of the Internet over the last few years
has grown and continues to grow exponent...
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- Spring '14