Excuse me Sue I didn't explain may sefl correctly

here is the situation
Server Exchange  2003  SBS   &    +/- 5 Outlook 2003
we're 5/6 users using outlook2003  over Lan

User A  on computer A  is using  Outlook 2003  he open the contact item
"John Do" and he is updating some information

User B on computer B open the same contact item 10 sec after User A ,  User
B want to modify something and save while USER A is still updating the
contact item

How do I know from computer B accout UserB  that this Item is currently busy
(User by User A)

I hope this example is more explicit

thks

Actually I use a workarroud solution by putting the name of current user in
a field and save the item
When the item is release I flush that field

When someone open the item, if the field is emplty I allow all operation
otherwise i only allow to see the contact item

this work but...
I have to perform save item  twice (at the opening / closing)  even if the
user modify nothing on the contact item

YOu can return the current user in VBA or VBScript behind a custom form with
a call to Application.Session.CurrentUser.