I think it is done with macros. You assign certain groups of letters to a macro that runs when those letters are typed in consecutively. You will have to enable macros as the default and disable the warning on every computer that you do this to.
nope. easier than that! Go into word, options, autocorrect, change it to auto correct the words into other words. Works especially well with anything before office 2000 as it doesnt come up with the little box to undo autocorrect.
Another fantastic one with windows 95 or some 98 computers. Change the shutdown 'it is now safe to turn off this computer' to 'it is NOT safe to turn off this computer' honestly. Had the teacher and IT techie fooled for aaages!!
lol.