worksheet linked to a cell
 

Is it possible to have a hidden worksheet linked to a cell and a formula in
the cell that links to the worksheet?
This would be perfect:
When cell k4 is activatet a worksheet opens and allows the user to wright
data in the worksheet. K4 in the original sheet shows =sum( : ) in the other
worksheet. It only has to be a very small working area, 2 collumns and up to
10 arrays...
Does this make any sense?