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set current record to a record with a relative position index
set current record to a record with a relative position indexthis function is only to be used through the macro functions:
pblKfThis( k, okey, okeylen ) read key of current record
pblKfNext( k, okey, okeylen ) read key of next record
pblKfPrev( k, okey, okeylen ) read key of previous record