1) In general, an intermediary is a person or service that is involved as a third party between two or more end points in a communication or transaction.n the World Wide Web, the role of an intermediary is sometimes said to be no longer necessary as, for example, when you look up legal or medical information directly yourself or when you share files with other Internet users directly (see peer-to-peer).
A roof covers a building or home structure, protecting any belongings found within. There are a large number of materials that can be used to roof a building or home, including several types of metal roofing materials. These materials include steel, aluminum, copper and tin.
How long does a roof last is dependent on the material that the roof is made up of. Different materials have different time span. Some can last for 10 years, some 40 and some even for 100 years.A roof can be made of clay, wood metal or asphalt. A well built roof is very important in order to shelter oneself from the outside weather conditions.ifferent materials have different time span. Some can last for 10 years, some 40 and some even for 100 years. A roof can be made of clay, wood metal or asphalt. A well built roof is very important in order to shelter oneself from the outside weather conditions.