direction; the size of the step for each keystroke is
controlled by the PF1--PF4 keys: PF1 = 1 pixel, PF2 = 4 pixels,
PF3 = 16 pixels, PF4 = 64 pixels. The user indicates that the
cursor has been positioned by typing any character other than an
arrow or PF1--PF4 key [control characters, eg, ctrl-C, and other
special characters should be avoided, as they may be intercepted by
the operating system]. 

<DT>Author
<DD>C. K. Lee, 1989.
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