yeh virtual memory keya hi or low kis waja sy hote hi or ager low ho jaye to keya karna parta h
2 dosra yeh keh jub hum comp start karty hayn or jo program soro mean auto maitc start ho jty hayn ayk to wo han jo hum ko nazar aty han dosry wo jo nazar nahi aty en ko band krne k leye keya karna parta hi ta ka computer ke start hone ke speed tez ho saky