In a script, I want to read all lines of a table. But the notation "&cell[table,column,i]" works only for the visible part of the table.

Yes this is true. In order to get the non-visible table lines as well, you have to work with

GetTableAttribute

and

Enter "/ScrollToLine=..." Table=...

For an example, please see Tips&Tricks No.9 Scrolling through a table.