Linking cells and still be able to edit both of them

Hi

Hope one of you can help me. I were wondering if it was possible to link to cells, and still be able to edit both the cells.

Example:
I have two worksheets, one is the calculation-sheet and the other one is a Input-sheet. I wanna make the input sheet for people who don't know everything about the "simulation". Thus, people should be able to type in information in the Input-sheet and it will change in the calculation-sheet. But I ALSO wanne be able to type in the calculation-sheet, and then it should change in the input-sheet. (Conclusion: write both places with a link between)

Hope you understand, it is a bit difficult to explain ,
Casper

If i use macro's or something like that, would it then be possible?.... something with comparing the time of entering, and then save the newest in both cells?

I would really help if it was possible somehow!

No it is around 50-80 cells (and they are not in a straight row or collum). I'm still new to this, so actually, if you have a good idea for a code or where to read about it, I would be thankful

I was thinking about this code, but so far i cannot limit it to a single cell:

Private Sub Worksheet_Change(ByVal Target As Range)
XXXXXXXXXXXXXXXX
End Sub

/Casper