Under the "cost per action" system, advertisers decide what they are willing to pay for a specific action, like a purchase or a software download.

Like Download.com, it is a "popular destination for software downloads".

The toolbar also comes bundled as an add-on with other software downloads.

This is done to provide convenience and cost savings for end-users without any additional software downloads or equipment.

The initial software download and all new content are free, with a monthly subscription required to play beyond the first 24 hours.

The browser-based version loads straight to the browser without a software download.

Gnutella isn't a Web site or a software download.

I.e. no software download is needed to participate with a full multimedia experience.

Common to webchat, its chat rooms required no software download to use.

This model requires a software download when it is powered on to be able to operate.