Problem connecting to Mysql?

[lancet2003]

Hi:
I installed MySQL database server & standard clients 4.0 and run it in Window 2000, and when I run winmysqladmin.exe in bin directory, the parameters shown in myini.Setup are
user=aaa (aaa here is not root)
password=bbb
And the Database Server shown is ccc.tamu.edu

So are the following problems:
1. in cmd DOS, in using the mysql database,
select * from user
Why the user aaa is not there???

2. In php programming.
   $link=(mysql_connect("ccc.tamu.edu"));
   It can work,
   mysql_select_db("databasename",$link)
   It can not work
   So here , what is the default user for database server connection? The user of my local computer? If I want to connect to the database, which user can I use. I use
   user=aaa
   password=bbb
   or even local computer user and password, no one can connect to database server.

3. How can I get the password of user root?
   Appreciate your help.