Alternative Input Devices

Devices for the Hand:

• Pens
• Touch Screens
• Game Controller

Pens: 

• With a pen-based system,we use an electronic pen to write on the screen and choose command.
• Pens are common input devices for  handheld computers,like"Personal digital assistants(PDAs)."
• Pens are handy for making notes or selecting commands,not for inputting a lot of text.

Touch Screens:

                                                            

• Touch-screen systems accept input directly through the monitor.
• Touch screens use sensors to detect the touch of a finger.They are useful where environmental conditions prohibit the use of a keyboard or mouse.
• Touch-screen system are useful for selecting options from menus. 

Game Controller: 

• The two primary types of game controllers are joysticks and pads.
• Game pads usually provide controls for each hand.
• joysticks are popular for flight simulator and driving games.