Through its Computers for Learning program, the federal government has placed hundreds of thousands of surplus computers in schools across the country on a needs-first basis. Schools register and request equipment on the Computers for Learning web site, and federal agencies match their surplus equipment to schools with those needs. Most, but not all, of the available computers are Windows-based PCs rather than computers made by Apple. Most of the donated machines are older models, but as the government continues to upgrade its computer systems, the number of surplus Pentium computers will sharply increase. Computers and equipment are not refurbished by the government before being shipped to schools, nor are they covered by warranty.