New pro/con: .
Most modern computers run more than one process at once; background & foreground. Assume that the op sys + multi-CPU allows these very many processes to proceed simultaneously; not shared sequentually on the one-only CPU.
New pro/con: Most modern computers run more than one process at once; background & foreground. Assume that the op sys + multi-CPU allows these very many processes to proceed simultaneously; not shared sequentually on the one-only CPU.