>Sorry, I must be wrong in my expressions, it is actually the selection of a row in a grid and not a pointer.
>Because the source of the grid is a cursor, I have to make a new SELECT whenever I want to make a change of a record. It is not normal to try to change a cursor via grid, but it is the way the people work here, and I am new on this project, so I cannot use a view, which would be the more logic (and easier?) way.

It's pretty normal to use cursor as grid.recordsource. If you want to move pointer to particular grid row, it's the same as moving record pointer within the cursor, i.e.
Select Mycursor
Go 5 && if e.g. you want to start with the fifth row
Thisform.Grid.Setfocus