VGA, or video graphics array, is the universally available method in modern computers to display graphics and visual information. Although some machines will have HD/HDMI/Video output options available, VGA continues to be the default display method. In order to enable any display method to a computer or laptop device, a cord must be attached to the device to transfer the signal. The VGA signal can be shown at multiple locations by using a VGA Splitter cable.
One reason a user may need the VGA signal split is to show the same display at multiple monitor locations. This may be used to complete a sales presentation, training presentations, LCD projectors or to allow a larger display on a second device (such as a televison). An additional reason the signal may need to be split is to allow usage of multiple monitors to increase the amount of visual workspace allowed by the computer. When splitting the display across multiple monitors, each monitor will display a selected portion of the screen and have a unique output.
The first type of VGA splitter cable is a male to female Y shaped cable. The cable will plug the male side into the back of the computer or laptop in the same way a monitor would be attached; the two female connectors receive the plug from the monitor devices that will be used. This type of cable is available in a variety of lengths and is traditionally used to allow simultaneous display of one picture on both screens. More advanced cables of this type will have a series of female ports to allow multiple monitors, LCD projectors, televisions with VGA input and the like to display the output simultaneously; it can be difficult to find one cord with more than thirty female connectors. Prices are low for this type of splitter and start around $4; superior quality cables will offer gold plating in the connectors and start around $10.
A second type of VGA splitter cable offers the ability to split the VGA signal between a VGA device and additional visual output device such as S-video or HDMI. This is typically used to connect a computer to a television or HD monitor. The cable will have one male VGA connector and two or more female connectors of different types. Newer computers may not require the splitter as it is now common for machines to offer s-video and DVI output on the standard package; however, just because a computer does not offer these output offerings on the back of the machine does not mean that the video card equipped on the computer does not support the output. Prices will vary based on the type of secondary output device and generally start around $10 per cable; the longer the cable the more expensive the price and greater chance of signal degradation.
In order for a computer to truly split the display across different displays for a unique picture on each screen the user will need to confirm the graphics card is capable of multi-monitor display. For XP users, a simple download from Microsoft can enable this capacity for up to 10 computers. However, for Vista and Windows 7 users, a new or additional graphics card may be required. You may confirm you graphics card capacity in the settings portion of your control panel, and by calling the manufacturer of the graphics card you may confirm the abilities of the device.