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foreground: [UNIX] vt. To bring a task to the top of one's
   stack for immediate processing, and hackers often use it in
   this sense for non-computer tasks. "If your presentation is due
   next week, I guess I'd better foreground writing up the design

Technically, on a time-sharing system, a task executing in foreground is one able to accept input from and return output to the user; oppose background. Nowadays this term is primarily associated with UNIX, but it appears first to have been used in this sense on OS/360. Normally, there is only one foreground task per terminal (or terminal window); having multiple processes simultaneously reading the keyboard is a good way to lose.