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Forms, in conjunction with a back end database, can enable a user to search for specific information or automatically provide a user with date-sensitive or eventsensitive information. The form shown in Figure C-1 is a good example of a back-end database. Holli Boyd s database contains her postcards, which are merged into a form generated from user input to create pages on the fly. The system then sends the recipient notification of the card. Discussion forums and chats also use forms to enter and retrieve data from a server. Shopping carts and auctions are yet another use of forms. It s important to realize that whereas GoLive enables you to design the form (as in 16), it doesn t provide the actual communication between the form on your page and the server-side actions that are required for the interactivity. When a user clicks your Submit button, a command is sent to the Web server, just as when any link is clicked or URL is typed into the address bar. But Web servers are designed to serve pages, not to search a database or phone a credit card company. So a third program, sometimes called middleware, must come into play. The commands calling for this program are hidden in the form request that gets sent to the server (because you put them there using the GoLive interface).

Now comes Photoshop 6, which permits you to bundle and color-code layers into logical clusters (this chapter), blend color channels independently of each other ( 13), and even add vector-based lines and shapes ( 14), not to mention object-oriented text ( 15) In fact, in a long line of layer-boosting champions, Photoshop 6 bears the standard with more gusto than any release since Version 3 Mind you, there s still room for improvement For example, one day I hope to see Photoshop integrate parametric effects, in which filters such as Unsharp Mask and Motion Blur are fully editable, interactive, and interchangeable, on the order of Adobe s full-motion editor, After Effects But in the meantime, Photoshop 6 s layers provide us with more freedom and flexibility than we ve ever had before.

When you cable up from your PC to some kind of sound output, you ve got your choice of two kinds of connections: SPDIF and speaker channel ports As described in more detail in 12, SPDIF stands for Sony/Philips Digital Interface It defines an all-digital transmission mechanism to move audio information from one device to another Speaker channel ports usually map directly to specific speaker channels such as front right and left, center and LFE, and surround right and left SPDIF connections come in two formats Although one is universally called digital coax (short for digital coaxial), it uses the same kind of RCA jack common for many types of audio cables The other is an optical jack format called TOSLINK, a way of using fiber optic cables to interconnect audio devices.

Toshiba originally developed TOSLINK as a way to link high-end audio CD players to receivers (the generic name for this standard link-up is EIAJ optical); today most receivers and pre-amps offer four or more optical input jacks for CD and DVD players, as well as other devices such as a Media Center PC Optical digital cables cost nearly twice as much as coax digital, THX certified or not So-called digital coaxial cables are indistinguishable by eye from ordinary RCA cables That said, they re built to carry much greater frequency ranges than conventional audio cables (to accommodate all eight channels in a 71 scheme, you need at least three times the bandwidth of a conventional uncompressed audio cable to convey all the data) If you plan to play back THX-encoded movies, the company claims you must use THX-certified cables for best results.

For those of your who are wondering what I m talking about, permit me to back up for a moment The first and foremost benefit of layers is that they add versatility Because each layer in a composition is altogether independent of other layers, you can change your mind on a moment s notice Consider Figure 12-1 Here I ve compiled the ingredients.

Plastics and the Environment, Edited by Anthony L. Andrady. ISBN 0-471-09520-6 2003 John Wiley & Sons, Inc.

These cables cost two to three times the price of ordinary digital audio RCA cables, but may still be worth the added price Conventional wisdom says that because of its vastly higher bandwidth and immunity to electromagnetic interference (EMI) and radio frequency interference (RFI), optical cables are preferable to coaxial Either does the job, yet some audiophiles express strong preferences for one or the other (but unfortunately, some favor optical with the same rabid passion that others favor coaxial) One of your authors opted for optical because a large (42") CRT-based television set loomed immediately above the AV receiver, but both have used optical and coaxial cables with acceptable results..

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