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shtml is an extension that denotes that that document must be " parsed " ( as in : " text / x-server-parsed-html " ) or read by a CGI . For practicing engineers , researchers , and advanced students in signal processing , Active Noise Control Systems : Algorithms and DSP Implementations will serve as a comprehensive , state-of-the-art text / reference on this important and rapidly developing field . Content-type : text / plain ; charset = us-asciiThere is no doubt that there is a need from a variety of users with an infinite number of variations . Note that this method returns a pointer to the value of a typical colon-separated header , i.e ., calling URL_GetHeader ( url , " Content-Type " , & e ) might return " text / html . While they correctly state that colour should be used sparingly and the text / background contrast should be high , their list of recommended combinations includes red on green and red on cyan , despite the facts that the former renders reading impossible for those with certain forms colour blindness as well as being universally warned against for use with VDUs on the basis of empirical evidence ( e.g ., Pace 1984 ) and the latter is virtually unreadable in the colour plates they use as examples .