(1) See assistive technology.|
(2) Turned off. Not active. "Disabled" does not mean broken or in disrepair. It typically refers to software that has numerous options, or features, that are selectable by the user. If the option is disabled, which is often indicated by the lack of a check in a check box, that function is no longer active.
With regard to hardware, the term may refer to a normal operation or one a bit more severe. For example, one might flip a switch or move a lever to disable a function, or pull the plug out of the wall socket, or in a more extreme case, open the device and pull out or cut wires. Contrast with "enabled," which means "turned on" and active.
Disabling and enabling options in software are typically done by clicking check boxes. The top function is not active, while the bottom one is.