To refer to the value of an element (i.e. use it as a source string in an expression), just use the same array syntax as for assignments, e.g.
for line = 1 to 10
? line, $items(line,"SKU");" ";$items(line,"Description")
next line
for row = .minrow($table()) to .maxrow($table())
for col = 1 to 10
if not .isnull($table(row,col)) then
? row, col, $table(row,col)
endif
next col
next row
