The earliest pc operative systems ran only 1 program at a time. All of the resources of the system were on the market to the present one program. Later, operative systems ran multiple programs promptly, interleaving them. Programs were needed to specify earlier what resources they required in order that they might avoid conflicts with alternative programs running at an equivalent time. Eventually some operative systems offered dynamic allocation of resources. Programs might request any allocations of resources when they'd begun running. This
The earliest pc operative systems ran only 1 program at a time. All of the resources of the system were on the market to the present one program. Later, operative systems ran multiple programs promptly, interleaving them. Programs were needed to specify earlier what resources they required in order that they might avoid conflicts with alternative programs running at an equivalent time. Eventually some operative systems offered dynamic allocation of resources. Programs might request any allocations of resources when they'd begun running. This