1. A method, comprising: storing at least one password of a user on a computer; receiving, in an email program in said computer, an email message for the user from a network; determining whether said email message includes a control character, said control character specifying a computer application requiring a password; if said email message includes said control character, comparing said control character to a library of control characters, each of said control characters in said library of control characters corresponding to a command; if said control character in said email message corresponds to a control character in said library of control characters, executing said corresponding command, wherein said corresponding command displays a user interface in the email program, the user interface including at least two user-selectable actions specific to the computer application; selecting, by the user, an action from the at least two user-selectable actions specific to the computer application available from the user interface; executing the computer application in accordance with the selected action; and automatically authenticating the user onto said computer application by matching at least one of the passwords of the user stored on said computer to the password required by said computer application.