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Note that you can also distribute system down time over a longer period by migrating a few nodes at a time , subject to your requirements . The emphasis will be on involving participants in using communication tools such as discussion groups and chat ( or virtual conferencing ) that they can then use with their own students . “ If you can only donate a dollar per pay period , ” says Foster , “ your contribution will yet demonstrate your commitment to helping others . While I can only hope that individuals and civil society will continue to struggle against injustice , repressive governments everywhere will be heartened by the message from Washington that anything can be justified in the name of waging war on terrorism .