The example NBC used was watching the long jump and javelin at the same time as part of a track and field event.

FORBES: NBC Rolls Out New Olympic Apps

In another first, NBC Olympics Live Extra will provide multiple concurrent streams for select sports, such as gymnastics (each apparatus), track and field (each event), and tennis (up to five courts).

ENGADGET: NBC's 2012 London Olympics second screen and streaming apps for Android and iOS launch today

But the 24-year-old was pulled out of the event by USA Track and Field after his positive test at the US indoor championships in Albuquerque, New Mexico, on 28 February.

BBC: Ivory Williams ban boosts gold hopes for Dwain Chambers

Bryan Clay, 28, showed his mastery during the two-day, 10-event classic of track-and-field athleticism, earning the unofficial title of best all-around athlete on the planet.

NPR: American Bryan Clay Wins The Decathlon

For example, during a session of track and field, instead of viewing only a single feed that moves from event to event, a user can choose to watch a stream dedicated to a specific event, such as the long jump or javelin.

ENGADGET: NBC's 2012 London Olympics second screen and streaming apps for Android and iOS launch today