Ubuntu cooperates with Debian by pushing changes back to Debian, although there has been criticism that this does not happen often enough.

Rather, communication is only necessary when pushing or pulling changes to or from other peers.

Realtors have also collided with the Justice Department in several state capitals, where the industry has pushed legal changes that some say will harm nontraditional brokers.

And she pushed major legislative changes over critics' objections that the initiatives favored big business and big earners.

Spurred by the election results, several Democrats in addition to Mr. Obama are pushing bigger changes.

In the years to come, demographics are likely to push further economic changes: 55 percent of India's population is 25 or under.

Poles voted today for community councils nationwide and were expected to push forward democratic changes by ousting holdover Communists from their last bastions of power.

Some Democrats want to push changes in Iraq policy, and Republicans also expect Democrats to try to make early moves on domestic elements of their agenda.

They do not allow outside forces to push changes on them.

The others can push needed changes through the Parliament, and will help him avoid the temptation to make a cult of his leadership.