how-to scan a table using CQL3

[Thorsten von Eicken]

What is the proper way to scan a table in CQL3 when using the random
partitioner? Specifically, what is the proper way to *start* the scan?
E.g., is it something like:

select rowkey from my_table limit N;
while some_row_is_returned do
  select rowkey from my_table where token(rowkey) >
token(last_rowkey_returned) limit N;

or is it:

select rowkey from my_table where token(rowkey) >= 0 limit N;
while some_row_is_returned do
  select rowkey from my_table where token(rowkey) >
token(last_rowkey_returned) limit N;

Is there a docs page I overlooked that spells this out?
Thanks!
Thorsten