SQL worker objects

Given this code from the Manual

Do work.$definefromsqlclass(‘scWork’) ;;scWork is defined as query(char) and
bindvars(list)
Do work.$add(‘select * from table1 where col1 < @[binds1.col1]',binds1) Do work.$add('select count(*) from table1',) Do work.$add('select * from table2 where idCol >= @[binds2.idCol]’,binds2)
Do work.$add(‘select oneCol from table3’,)
Do initRow.$definefromsqlclass(‘scWorkInit’) ;;scWorkInit is defined as
hostname(char), username(char), password(char) & work(list)
Do initRow.$add(lHostname,lUsername,lPassword,work)
Do iWorker.$init(initRow) Returns #F
Do iWorker.$start() Returns #F

What does the list of binds1 and binds2 actually contain
Where binds1 and binds2 appears in the where clause, what do they mean, being there, and matching the list
I basically don’t get binds1 and binds2
I have heard of and seen bind variables in select statements but am not clear on their syntax
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