7. The communications network of claim 6 wherein said receiving display station further includes: means for calculating a distance by which the width of a screen page exceeds the width of the window within which the page is to be displayed, and means for setting said sequence of horizontal sampling positions at increments of said distance.
8. The communications network of claim 7 wherein: said means for sampling said information density sequentially samples the information along a plurality of horizontal lines, and said means for comparing compares each sequential sample on each of said plurality of lines to said selected density level, and further including means for calculating a mean horizontal position at which said selected density level is attained in said plurality of lines, said mean horizontal position being said reference margin.