WCDMA broadband code division multiple access
WCDMA (Wideband Code Division Multiple Access) is a European Telecommunications Standards Institute (ETSI, European Telecommunications Standards Institute) in 1998 developed the wireless access technology, aims to support third-generation multimedia services, such as voice transmission or video conferencing.
WCDMA can be compatible with existing GSM core network, so GSM sites and equipment can be a continuation. WCDMA can provide up to fixed 2Mbps, or actions between 384kbs speeds. High transfer rate require higher frequencies, the traditional GSM only 200kHz, WCDMA Zexu 5MHz frequency.
In 1999, in order to promote third-generation CDMA wireless standards, the global similarities, the industry Harmonic group (Operators' Harmonization Group) on common standards reach a decision, the heart's third-generation CDMA standard has three modes, WCDMA exclusive direct continuation patterns (direct - sequence mode for WCDMA) is one of the others include: CDMA 2000 multi-carrier mode (multi-carrier mode for cdma2000) and dual-mode CDMA time slot partitions.

WDM
1. WAVELENGTH DIVISION MULTIPLEXING: a fiber-optic (OPTICAL FIBER) transmission of data multi-tasking (MULTIPLEX) mode modulation (MOUDULATE), respectively, after each signal using a different spectrum (SPECTRUM) area to send .
2. WIN32 DRIVER MODEL: WINDOWS 98 and WINDOWS NT 5.0 shared hardware driver (DRIVER) architecture, designed for the use of WDM drivers in WINDOWS 98 and WINDOWS NT 5.0 to use, eliminating the need for two kinds of hardware, operating system vendors (OS) drive their own development the program disturbance.

Web bug
Bug (bug), there are two, one refers to the software flaw or defect, and the other is used to track the whereabouts of the user on the network, which is the so-called Web bug. Usually it is only the size of a 1x1 pixel transparent GIF image file, hidden in web pages or email letter, website or company can set up web bug to learn through the Internet User's browsing habits.
This may make you think of cookie, because the cookie can also be detected to some extent User interaction between the site, but the Web bug and the cookie is the biggest difference between the User may choose or not to accept cookie, but Web bug detection activity can do nothing because it is caught in the web page, but is also used as a general image file Bale.
As the Web bug is usually a transparent image file, representing space is very small, so User to discover its existence is not easy, unless deliberately opened the original Web page files and check whether there is a server location of images with other images storage locations are different. Web bug The image file is usually caused by a different server to send.
Web bug to track information including:
show where the user's IP address
Web bug where the web address
Web bug's own web site
Web bug was viewed time
user's browser type
previously set cookie content