Modern Etiquette HD is a handy guide to etiquette for the iPad.
The app covers five main areas: Business, Dress Code, Entertaining, Food & Drink and Table Manners. Advice ranges from conventions established in distant history, such as the rules for passing the Port, to modern recommendations for dealing with cellphones and text messaging.
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Another great app by Tomsoft, creators of Voice Changer HD and Ambience HD.