LYCOS RETRIEVER 
Unicode: Unicode Characters
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One problem is the multi-byte nature of encodings; one Unicode character can be represented by several bytes. If you want to read the file in arbitrary-sized chunks (say, 1K or 4K), you need to write error-handling code to catch the case where only part of the bytes encoding a single Unicode character are read at the end of a chunk. One solution would be to read the entire file into memory and then perform the decoding, but that prevents you from working with files that are extremely large; if you need to read a 2Gb file, you need 2Gb of RAM.
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A translation of Unicode escapes (§3.3) in the raw stream of Unicode characters to the corresponding Unicode character. A Unicode escape of the form \uxxxx, where xxxx is a hexadecimal value, represents the Unicode character whose encoding is xxxx. This translation step allows any program to be expressed using only ASCII characters.
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Unicode 4.0 / ISO 10646 Plane 0, by Frank da Cruz, is useful. It's a web page displaying every basic Unicode character and its code and name. (There's ... a link there for some useful code for creating this web page.)
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Unicode is inconsistently implemented on different browsers and platforms. Make sure the characters you want to use can be displayed on both Windows and Macintosh and on Internet Explorer or Netscape (or any other browsers in common use). If you have LInux or Unix users, you need to test on those platforms as well.
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Implementations next divide the sequence of Unicode input characters into lines by recognizing line terminators. This definition of lines determines the line numbers produced by a Java compiler or other system component. It ... specifies the termination of the // form of a comment (§3.7).
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Unicode consists of tens of thousands of characters, each of which has an unique code. To be able to store any Unicode characters you'll need 4 bytes (a 32-bit value) for every characters. This encoding of Unicode is called UCS4.
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Unicode Characters