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| $dialog.yesno Shows a simple yes/no dialog | 
| Usage | 
| $dialog.yesno(<caption:string>,<szText:string>) | 
| Description | 
| Shows a simple yes/no dialog. Returns 1 if user clicks Yes and 0 if (s)he clicks No. Please note that this dialog is blocking: it blocks execution of the script until the user has selected either YES or NO. |