> I installed IBO_4_2_F and IBO_4_2_Fn, and there exists a library
> IBO40CRT_D6.bpl in the folder
> Programfiles/borland/delphi6/projects/bpl

This sounds OK - I presume that you expanded the IB4_D6_DCU zip into
the folder Programfiles/borland/delphi6/projects/bpl (check the
file timestamps).

> I connected the IB_Datasource to IB_cursor, IB_Cursor connected to
> IB_Connection and connection is active, then I connected IB_Grid to
> IB_Datasource is it wrong

IB_Grid should be connected to IB_Query (not IB_Cursor). There is a
special component IB_StatementGrid for connection of TIB_Cursor and
other unbuffered datasets.

Probably we should be checking the assignment of the datasource to
check that the associated dataset is buffered.

--
Geoff Worboys - TeamIBO
Telesis Computing