=> R0 = window handle (-1 to turn off)
R1 = icon handle, or -1 for window area
R2 = x offset
R3 = y offset
R4 = height + flags, or -1
R5 = index into string, or -1
This SWI moves caret to a new position. If the caret is moved to a new window, a LoseCaret message is sent to the owner of the old window, and a GainCaret message is sent to the owner of the new one.
The index into the string is a byte index, not a character index - there is only a distinction when the system alphabet is UTF8.
See PRM 3, page 152.
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