Unanswered: Locking cells on data entry confirmation
How does one achieve locking a cell after data has been entered into it. Just a cell not the whole worksheet. Data is entered cell by cell into, say, range A1:A1000. The aim is to have a cell locked when the ENTER key is operated. All cells with data are locked and those without unlocked. A password is required to unlock the cells.
I'm not sure how well this will answer your question, but if you go to Format annd then Cells and look at the Protection tab then you will see a tick box for locking a cell or range of cells.
Now this only comes into play when Protection is enabled - click on Tools and then Protection. You can limit what cells users can click on (have a play and experiment) and you can set a password which means you cannot edit a locked cell.
HOWEVER as I understand it you want the cells unlocked until the user enters something and then for a cell to automatically lock once data is entered. I'm not so sure about this, but if you had a macro which is triggered by hitting the enter key or on any data entry event (and I am not sure myself how to deliver this), then that macro could perhaps lock the cell you had just entered data in?
I hope these random thoughts will at least point you in a productive direction and I should be very interested to hear what working solution you come up with.
PS Incidentally, another idea I have just had would be to create a user data entry form into which the user can enter one item of data at a time. Now a macro behind this would be easy and it could write the data into a protected sheet in a column which the user couldn't edit, but could look at and print - would that be any good?