You can't and keep them open at the same time.

The guy in front of me said they would open at 11.

Several programs from any group can be opened at the same time.

The building was opened in 1902 at a cost of $21,000.

A door opened at the far end of the room.

The new center is set to open at the end of this month.

Just then the door opened at the other end of the room.

The building opened in 1970 at a cost of $2.8 million.

The new stand opened 1971, at a cost of £1 million.

The loss had the 49ers open the season at 0-1.