SysIClass Attribute. System image identifier
Source position: intuition.pas line 2208
| const SYSIA_Which = IA_Dummy + $0D; | 
Specifies which system gadget you want an image for. Some numbers correspond to internal Intuition
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 | SYSIA_Which tag data values. Window depth gadget image | |
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 | SYSIA_Which tag data values. Window zoom gadget image | |
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 | SYSIA_Which tag data values. Window sizing gadget image | |
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 | SYSIA_Which tag data values. Window close gadget image | |
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 | SYSIA_Which tag data values. Screen depth gadget image | |
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 | SYSIA_Which tag data values. Left-arrow gadget image | |
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 | SYSIA_Which tag data values. Up-arrow gadget image | |
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 | SYSIA_Which tag data values. Right-arrow gadget image | |
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 | SYSIA_Which tag data values. Down-arrow gadget image | |
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 | SYSIA_Which tag data values. GadTools checkbox image | |
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 | SYSIA_Which tag data values. GadTools mutual exclude "button" image | |
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 | SYSIA_Which tag data values. Menu checkmark image | |
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 | SYSIA_Which tag data values. Menu Amiga-key image |