The three major shop-at-home service providers are staking out their share of territory as home shopping continues to expand in the supermarket industry. The following are thumbnail sketches on each provider and the companies' priorities for the near future:
a major Internet presence. Its first on-line program is set to begin this month with Vons Cos., Arcadia, Calif.
"Our focus is to accelerate on-line growth but not at the expense of abandoning our core customer base," Olson