you won't be able to do it this way. What you need to do is have the time and
person saevd to a database or a text file. This would be pretty fast to
read/write, so that the chances for a collision would be quite small. Here's
a very simple demo

Option Explicit
Const TimeFile As String = "c:\TimeFile.txt"
Sub SaveTime()
Dim test As Date
test = "10-oct-2005 12:45"
If Not_Available(test) Then
MsgBox "Timeslot " & test & " Not Available"
Else
SaveDown test, "JohnDoe"
MsgBox test & " saved"
End If

End Sub
Private Function Not_Available(timeslot As Date) As Boolean
Dim ff As Long
Dim text As String
Dim data As Variant
ff = FreeFile
If Dir(TimeFile) = "" Then
Not_Available = False
Else
Open TimeFile For Input As ff
Do Until EOF(ff)
Line Input #ff, text
data = Split(text, ",")
text = data(0)
If text = Format$(timeslot, "yyyymmddhhmm") Then
Not_Available = True
Exit Do
End If

Loop
Close
End If
End Function

Sub SaveDown(timeslot As Date, username As String)
Dim ff As Long
Dim text As String
text = Format$(timeslot, "yyyymmddhhmm") & "," & username
ff = FreeFile
Open TimeFile For Append As ff

Print #ff, text
Close


End Sub


I hard coded a file name. Test will try to save an appointment. This can
easily be adapted to get a time/date and user name from the workbook - but
this is a demo

The program checks whether th etime slot is available by reading the file,
then if the slot is available, it writes to the file.
I use dthe C drive for the demo, but if you opt for a similar route, you'll
need the file on a network folder that the users all have access to etc.

HTH


"kwokhong" wrote:


Hi,

I've got an excel spreadsheet that is shared by many users. The user is
suppose to enter their name into a timeslot they prefer for their
monthly health checkup.

The problem:

How can I protect the cell which users have entered their name into the
spreadsheet? I don't want people to replace the names in a timeslot with
their own names. How to achieve that?

KH


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