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What does TBSCAN GENROW mean in Explain Plan?

In a DB2 Explain Plan, what does TBSCAN GENROW (line 5 below) mean? SELECT STATEMENT ( Estimated Costs = 1.811E+03 [timerons] ) 1 RETURN 2 NLJOIN 3 [O] TBSCAN 4 SORT ...
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What does HSJOIN mean in an Explain Plan?

I have the following EXPLAIN PLAN results from a query on my DB2 database. 0 SELECT STATEMENT ( Estimated Costs = 5.928E+02 [timerons] ) 1 RETURN 2 HSJOIN 3 [O] ...