Some places to find late deals for holidays and hotel bookings would be: Expedia, Travel Supermarket, Last Minute Travel, Unsold Hotel Rooms and Thomas Cook.

A hotel information system contains information about a hotel and its business. So it would have details of rooms or bookings and guests. People using it would be able to check if rooms are available and make bookings, take payments etc.

There is a vast number of US companies that currently specialize in last minute hotel bookings some of the most popular are Expedia, Travelocity, and Hiltons as well.

Yes

Yes it is. Every hotel makes allotments with travel agencies, these allotments are not guaranteed by the travel agencies that will be filled 100% in all seasons. So in order for the hotel to have as many bookings as possible in all times, they make allotments for more rooms than what they actually have.

So when the high season is on and travel agencies get more requests for bookings, the hotel receives more bookings than it can possibly accomodate. If they are overbooked, the hotel management has the obligation to move the client in a same or better category hotel in the same area.