Attempts to log in the specified user.
public bool Login(string UserName, string Password);
True if the log in was successful. The reasons it may fail are:
The user name does not exist in the list of authorized users.
The password is not the correct one for the user.
Someone else has logged in with this user name.
The number of concurrent licenses has been exceeded.
The ErrorMessage property contains the text of the reason for failure.
The name of the user to log in as (case-insensitive).
The password for the user (case-insensitive).