How to restrict multiple logon on CRM 2007 Web UI

Dear experts,

From Note142724,

I know that we can restrict multiple logon when using SAPGUI.

But I want to know how to restrict multiple logon when using CRM 2007 Web UI.

Concretely, I want to know setting that we can select only following two choices.

・Continue with new logon and end any other logons in system

・Terminate new logon

Thanks in advance.

Best Regards,

Takehiko