=> R0 = 0
R1 = &400C1 (reason code)
R2 = button number
1 OK
2 Cancel
3 Rightmost additional button
...
R3 = pointer to extra button string
<= R0 = 0 to return to application
R1 = preserved
R2 = Button number (normally unchanged)
/or/
R0 = 1 to redisplay error report
R1 = 0 (claimed)
R2 = pointer to block holding registers for new call to Wimp_reportError
This service is issued when a button is pressed on a Wimp error box. You can use it to detect clicks on buttons you may have added using Service_ErrorStarting.
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