Persons with severe motion impairment like biplegics, quadriplegics etc. face difficulty in accessing computerbased systems since they can not use conventional computer access devices like mouse or keyboards. Alternate access mechanisms consisting of scanning and access switches have been developed for such users. One problem with scanning based access mechanism is that it slows down the user-computer interaction significantly leading to user frustration and fatigue that in turn results in further drop in user performance. To address this issue, this paper presents a scanning mechanism that adapts itself according to the user's requirements. This adaptation leads to an improvement in user performance. The performance improvement of the proposed adaptive scanning mechanism is demonstrated in the paper with user testing results.

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High availability is becoming increasingly important as our business depend more and more on computers. Unfortunately, many off-the-shelf solutions for high availability (HA) are expensive and require expertise. This paper explains the design and implementation of an inexpensive high-availability solution for our business-critical needs without requiring the use of expensive additional hardware or software.Along with discussion on high availablity, this paper also discusses the data integrity of files and database, of the services which are to be made highly available. Using HTTP as the service example and MySQL as the database to be replicated for data integrity, a two node cluster has been configured to implement the concept. 10th International Conference on Information Technology 0-7695-3068-0/07 $25.00 © 2007 IEEE DOI 217 10th International Conference on Information Technology 0-7695-3068-0/07 $25.00