sentences:  At first, only a few Altos were built.Although by 1979 nearly 1,000 Ethernet-linked Altos were in use at Xerox and another 500 at collaborating universities and government offices, it was never intended to be a commercial product.Then in 1977, Xerox started a development project which worked to incorporate the Alto innovations into a commercial product; their concept was an integrated document preparation system, centered around the (then expensive) laser printing technology and oriented towards large corporations and their trading partners.