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Winlogon sends messages to the GINA while dialog boxes are displayed. These messages are all encapsulated in the WLX_WM_SAS message as follows.
| Secure attention sequence type in wParam parameter | Description |
|---|---|
| WLX_SAS_TYPE_CTRL_ALT_DEL | Indicates that a CTRL+ALT+DEL key sequence was received. |
| WLX_SAS_TYPE_SC_INSERT | Indicates that a smart card has been inserted into a compatible device. |
| WLX_SAS_TYPE_SC_REMOVE | Indicates that a smart card has been removed from a compatible device. |
| WLX_SAS_TYPE_USER_LOGOFF | Indicates that a user requested logoff. |
| WLX_SAS_TYPE_SCRNSVR_TIMEOUT | Indicates that the screen saver should be run due to lack of user input. |
| WLX_SAS_TYPE_TIMEOUT | Indicates that no user input was received within the specified time-out period. |
For time-outs and logoffs, Winlogon will close the dialog box after the message has been sent. This message is sent so the dialog box operation can respond in a useful manner (for example, by closing itself down if a logoff has occurred).
For input time-outs, the dialog box is closed with the code WLX_DLG_INPUT_TIMEOUT.
For screen saver time-outs, the dialog box is closed with the code WLX_DLG_SCREEN_SAVER_TIMEOUT.
For logoffs, the dialog box operation is closed with the code WLX_DLG_USER_LOGOFF.
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