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By Peter Flewitt (auth.)
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The standard letter into which these variables are to be merged will be set up in the fashion: 31 March 1985 Dear m It gives me great pleasure to write to you as one of our oldest and most valued customers ••••. Fig. 17 Any further variables to be incorporated into the bodyof the letter would need to appear on the variables page after the salutation, and be identified with a similar merge code. An alternative method found on most word-processing packages for microcomputers and some dedicated machines is to set out the variables thus: &Mr John Brown 14 High St Anytown Midshire XS3 4YG& &Mr Brown,& Fig.
Having classified the users, or operators, it is now possible to classify the files themselves so as to be accessible only to certain people, thus: 1 SECURE - Accessible only from a specified workstation to the 'principal' or 'owner' of a specific file area, such as Personnel. 2 CONFIDENTIAL - Accessible only to the 'owner' but from any workstation. 40 3 RESTRICTED - A special class of file accessible to designated users, but not to be edited or deleted. 4 DESIGNATED - Accessible to designated users for reading and modification if required.
The disks are spaced out along a central spindle, and read /write heads are positioned between the disk faces so as to record or 'write' data or text on to the disk, or 'read' from the disk into the main memory of the machine. In practice the outer surfaces of the two outer disks are not used so, in a disk pack consisting of ten disks as shown, there would be eighteen surfaces available for text storage. Fig. 30. A 300 megabyte disk pack (photo by courtesy of Dysan Ltd) Winchester diskpack The Winchester drive is a special kind of disk pack developed for use in microcomputers and word processors.