Vulnerable Security when Log on using a different Microsoft Windows user account

[adee]

Hi All,

I think this is a critical problem because related to
security issue.
The problem is:
I log on my friend PC, so I use feature "Log on using a
different Microsoft Windows user account".
After I finished using Project Central/Server then I log
off. BUT,
when my friend klik button "Log on using a different
Microsoft Windows user account", my friend can access
Project Central with my account directly. There's no form
come out to ask username and password. It directly go
through Project Central with my account.
Anybody can help me to solve this. Is ther something I
have to re-configure?