[Zope] is it possible to see whether any user is using a perticular zope object

hi, I got your reply. thanks. Actually my problem is not that. I am doing some web based stuff. So it is natural that more than one users can access the same page at the same time. So in my project, if such a situation comes then at least one user will get the error message. To avoid that I am planning to block one user until the other gets the complete page downloaded. So if it is possible to see whether the method is used by another user, then I can block that new user until the first user completes his task. How can I use <dtml-var REQUEST> tag for that. OR do u have any other alternative solution. I will be grateful to u. thanks bye yours, K.H.Subrahmanyan ( subrahmanyan.kalathur@wipro.com )