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Yes, the Lenovo IdeaCentre A540-24 All-In-One system has a HDMI-Out port for an external monitor.
Short answer, yes. It has an HDMI port which should allow you to use a dual-monitor setup, whether extend or clone.
Yes it does. You can hook up a second monitor and extend your screen to a second monitor giving tons of real-estate to display multiple applications at one time. I am currently utilizing a second monitor. On one screen I have my browser up for research and the second with an application such as word or excel.
I've hooked up a second monitor, but it only mirrors the main screen. Not what I wanted.