[SQU] Squid Auth question

Hi, I need following configuration:
On one WinNT Worstation are 2 users - user1 & user2.
When user1 is logged in,he can use proxy without limitation (wihtout proxy
auth), but when user2 is logged in and start use internet (squid proxy 2.4),
then proxy server asks for username & password.
And is possible make Squid "look" to Windows 9X or NT login name, if is,
then how?
Can You give me advise?

Thanks in advance,
Gatis Erics

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