multitasker

noun2

1. •
   Someone who multitasks, who performs multiple tasks at the same time.
2. •
   A computer system that multitasks.

   • This week we take a close look at four top contenders in the multitasking arena […] Other bolt-on multitaskers for PCs not included in this comparison include VM/386, Omniview, and Double DOS. — 1990