Vicky,
One way to do what you want is as follows:
(a) Ensure that you have a field on your form which is unique for every record (it may be hidden). I'll assume that this field is called RecordId.
(b) I will assume that the records that you want to protect have the RecordId field set to "RecA", "RecB", "RecC" and "RecD" respectively, and that you have set these up before hand.
(c) Place the following code in the On Current event of the form:
Dim F as Form: Set F = me
If F!RecordId = "RecA" OR _
F!RecordId = "RecB" OR _
F!RecordId = "RecC" OR _
F!RecordId = "RecD" Then
F.AllowAdditions = False
F.AllowDeletions = False
F.Edits = False
Else
F.AllowAdditions = True
F.AllowDeletions = True
F.Edits = True
Endif
With this method, the identifying field of each record will be examined as the record is loaded into the form, and the form "locked" if the current record is one of your four protected records.
Hope this helps,
Cheers,
Steve