If you have a single VGA, then following two options are available:
1. VGA Y-splitter: Be careful, it will give two monitor output, but they will display the same output. It doesn't cost much.
2. Independent multi-monitor setup
You could use a multi-port Graphics card, or another popular usb-vga device that has a graphics chipset built into it. You can have 2,3,4... independent displays. Might have seen in some prop-trading images.
Don't fall for the usb-vga mirrored devices, they will also just mirror your main screen on the second one. This device is for compact laptops/notebooks that don't have VGA/HDMI port. Good for presentations etc
1. VGA Y-splitter: Be careful, it will give two monitor output, but they will display the same output. It doesn't cost much.
2. Independent multi-monitor setup
You could use a multi-port Graphics card, or another popular usb-vga device that has a graphics chipset built into it. You can have 2,3,4... independent displays. Might have seen in some prop-trading images.
Don't fall for the usb-vga mirrored devices, they will also just mirror your main screen on the second one. This device is for compact laptops/notebooks that don't have VGA/HDMI port. Good for presentations etc