9. A computer system including processing means for controlling operation of the computer system, a touch sensitive display screen and a stylus for inputting information to the processing means by touching the stylus to the screen and moving the stylus across the screen comprising: means for detecting when a case setting gesture is inputted by the user, the case setting gesture taking the form of a single substantially vertically extending line input onto the display screen at a location that overlies a textual object and does not include a significant horizontal component; means for identifying a portion of the overlaid textual object as being a first character or the overlaid textual object; and means for setting at least the first character or the overlaid textual object to one of the group consisting of upper and lower case based upon the direction that the case setting gesture is drawn by the user.
11. A computer system as recited in claim 9 wherein case setting gestures drawn in the upward direction are interpreted to require that the identified portion of the overlaid text be set to upper case and case setting gestures drawn in the downward direction are interpreted to require that the identified portion of the overlaid text be set to lower case.