It encouraged the public to participate in the light out activity on 8 August, requiring participants to turn off the lights for 3 minutes since 8pm.

Microsoft will no longer be able to require other participants in the PC market to favor its products over those of rivals.

Among other things, he required participants to take part in at least one discussion on a topic they knew nothing about.

Never mind that the pageant requires participants to parade in swimsuits for millions of television viewers.

These are technical arguments - and require suitably educated participants.

The i.play has switches and lights which light up and make sounds, requiring participants to push them to earn points.

Some municipal and commercial recycling programs require participants to separate clear, brown, and green glass.

Throughout the testing, multiple clues have required participants to travel to various physical locations to retrieve the next clue.

By now I was not the sole target: a good cantina fight requires multiple participants, or it's downright boring.

The religion is open to everyone and does not require new participants to partake in an initiation process.