Sorting in Numbers is available. No problem there. I just did it.
There is nothing called the tab key but there is a nice feature on the
number keypad to allow moving to the cell to the right or below the
current cell. I really like the data entry in Numbers. I have never
tried to export a sheet to Pages. I use the iPad while on trips.
Otherwise I always have a computer around and use it.
Myron
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