The system variables @UPPER.CASE and @LOWER.CASE are not protected, so they can be amended by the programmer. Thus if you have a requirement to use a foreign language with AREV, you may amend these variables so that they can also cope with converting the higher ASCII lower case foreign characters (e grave, e acute etc) to their upper case equivalents (E grave, E acute etc). This is achieved by simply appending the appropriate characters to the end of the variables at logon. When these letters are typed into a field allowing lower case they will automatically be converted to the appropriate upper case letter. This technique has extended application for filtering out unwanted characters and replacing them with others throughout the system.
(Volume 1, Issue 10, Page 4)