How to check connectivity and del user?

[sogogo]

HI,

I installed the apache 1.3, mysql and php on my win2k prof. I granted a user:

grant all on * to bill@localhost identified by '123';

My questions:
1. how can I check list the users? any command?
2. how can I delete a user?
3. how can I check the connectivity among php, apache and mysql?

They work individually, testing page for apache can be shown, phpinfo() also no problem and mysqld can be started.

How can I know whether they all work fine?

Thanks

gogo