Only the column position can be modified using this interface, as the row position within a table control bound to a data source is given implicitly (by the cursor position of the data source).

Besides the normal opreration mode (which is used to display the database form's data) the control may for instance support a filter mode.

The selection used with the methods XSelectionSupplier::getSelection and XSelectionSupplier::select is a sequence of Any's.
Here the elements of the Sequence are the bookmarks (in the ::com::sun::star::sdb::RowSet) of the (to-be-) selected rows.

A grid control can contain own UI elements for traveling within the database form it belongs to (This concept seems to make sense, as a grid control - in opposite to other data aware controls - displayes not only one record at a time, but a larger number of records of the database form.)
With the help of this interface, external components which wish to handle such travelings themself can register interceptors for the actions in question.

Usual URLs to use include

.uno:FormSlots/moveToFirst

move the cursor to the first record

.uno:FormSlots/moveToPrev

move the cursor to the previous record

.uno:FormSlots/moveToNext

move the cursor to the next record

.uno:FormSlots/moveToLast

move the cursor to the last record

.uno:FormSlots/moveToNew

move the cursor to the (one and only) new record

.uno:FormSlots/undoRecord

undo the changes done so far in the current record

A concrete implementation of this service may offer more or less URLs, but if it offers some of the URLs above, it must stick to the meanings defined above.