visa维护用户的安全上下文，即登录数据(用来向IBMCognos8验证身份的数据)和用户的身份(用户所属的组和角色)。
A Visa maintains the user's security context, that is the logon data (whatever was used to authenticate to IBM Cognos 8), and his identity (the groups and roles he's a member of).
TinyLogin ：TinyLogin是一套tinyUNIX实用程序，它用于登录嵌入式系统、接受其验证身份、为其修改密码，并 能维护其用户和用户组。
TinyLogin: TinyLogin is a suite of tiny UNIX utilities for handling logging into, being authenticated by, changing one's password for, and otherwise maintaining users and groups on an embedded system.
TinyLogin ：TinyLogin是一套tinyUNIX实用程序，它用于登录嵌入式系统、接受其验证身份、为其修改密码，并 能维护其用户和用户组。
TinyLogin: TinyLogin is a suite of tiny UNIX utilities for handling logging into, being authenticated by, changing one's password for, and otherwise maintaining users and groups on an embedded system.
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