Bits 12-15 Meaning
0 Ignore everything (except menu).
1 Notify continuously while pointer is over icon.
2 Click notifies (auto-repeat)
3 Click notifies (once, no auto-repeat)
4 Click selects, move away deselects. Notify of release.
5 Click selects. Doubleclick notifies task.
6 3 + Drag (returns *16).
7 4 + Drag (returns *16). Moving away doesn't deselect.
8 5 + Drag (returns *16).
9 'menu' icon
10 Click (returns *256), Drag (returns *16), Doubleclick (returns *1)
11 Click selects (and returns *1), Drag (returns *16)
12-13 Reserved.
14 Click causes it to gain caret, can also Drag,
15 Click causes it to gain caret.
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