Dialog box with Time out. ?

[TerryRitchie]

Can I do a Yes/No Dialog box with a time out (say pick the default value if the user doesn't choose within a specific interval) ?

Sure. Pcopy your screen to another page, draw your dialog box and yes/no buttons, and then have code that checks for mouse input along with a timer. When the timer runs out Pcopy the other page back to your screen to remove the dialog box and choose the default value.