=> R1 = pointer to block
<= R0 corrupt
block contains :
0 window handle (-1 if off)
4 icon handle, or -1
8 x offset
12 y offset
16 height + flags, or -1
20 index into string, or -1
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 154.
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