Crossword puzzle clue "bottom rows on spreadsheets"

Bottom rows on spreadsheets

One who rows, rows, rows the boat

Web concerns ... and based on six familiar names hidden in rows 1, 4, 12 and 15 of this puzzle grid, what the black squares in those rows symbolize

Rows of rows

Money owed to a company, as shown on their spreadsheets

Like spreadsheets, e.g.

It's spread through spreadsheets

Job with spreadsheets