The User Agent, well the HTTP User Agent, is a string of data identifying the browser, browser version, the underlying Operating System and contains other miscellaneous information.
On a typical Fedora installation, you are asked for a root password and you will given an option to create accounts for normal users.
On the other hand, Ubuntu only allows account creation for normal users, root logins are disabled by default.
The Singleton Pattern is one of the most commonly used design patterns in Java. This design pattern is used to restrict the instantiation of a class to a single object.
Windows NTLM (NT Lan Manager) is a Microsoft authentication protocol used with the SMB (Server Message Block) protocol.
A lot of the protocol was reverse engineered by the Samba team – the people behind the Samba server that allow UNIX machines to share files and printers with a Windows client.
User Access Control (UAC) was introduced as a security infrastructure in Microsoft Windows Vista. It aims to improve the security of Microsoft Windows by limiting privileges of application software. Any request for an increase in privilege level has to be authorised by an administrator. In this way, only trusted applications receive higher privileges.
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Never leave your Firefox browser unattended with your password keyed in. Your password can be stolen even before you know it.