A single personal- computer program can contain millions of lines of complex programming code, so it's difficult for a corporate technical support staff to know all the intricacies needed to solve problems. One solution is to call a software maker's technical support phone, but that means racking up charges of $5 per minute and more. Computer Library thinks it has a better way.

Support on Site is a compact disk containing information and tips on some of the more popular but technically dizzying programs such as Aldus Corp.'s PageMaker desktop publishing package. The CD-ROM data base, which costs $1,295 annually and is updated monthly, also has the notes and information used by the software publishers' own technical support personnel. Currently, only a dozen programs are covered, but the New York company says it plans to add more programs soon.

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