Adding hardware such as a disc drive (e.g. CD-ROM or DVD), modem, mouse, network card, printer, sound card, or speakers are not required, but give the computer additional functionality. 1  How to install computer hardware.
Retroactive Payments. The SSDI retroactive payments are payments made to disability applicants for the time passed between the onset of the disability to the date that the application was passed. Retroactive payments are paid for 12 months prior to the date of the application being passed.
Retroactive payments are not available for SSI. In the case of Social Security Disability Insurance (SSDI), an applicant may receive back payments from the date of the application onward, and may also be able to receive retroactive payments from the onset date of the disability onward.