R2 = Title (eg. 'Message from MyTask')
R3 = Text (eg. 'Document not saved. Save?')
R4 = Pointer to block containing button definitons
Text for default button (eg. 'Save')
Text for button 1 (eg. 'Discard')
Text for button 2 (eg. 'Cancel')
...
R5 = Button to be used if 'Escape' is pressed (0-3)
Opens a requester box with a title, a message and some buttons along the
right-hand edge. The pointer is constrained to the requester window. The
buttons may contain any text up to 8 characters. You can have up to 4
buttons. They are filled with the text specified from the bottom one (the
default) upwards. If the text for a button is a null string then that button
will not be created. If the user presses Return then the default button is
pressed. If the user presses Escape then the button specified in R5 is
pressed. Mouse_Click events to the requester window will be passed from
WimpExt_Action filtered so that only Select and Adjust are passed through,
the window handle is -3, and the icon handle will be 0-3. You can check
whether the requester window is open by using WimpExt_CheckWindowOpen.
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