Joomla!®Plug

Hi, could you clarify for me the followings:

1. Should Joomla.Start.php be placed in the same directory on the server where I want to install Joomla? If so, I do not understand the need of the "Install Server Directory" (next).

2.
"Path configuration:
Install server directory:
please enter the full server path to the Joomla install directory, or a temporary path if ftp mode is set below, must have writing permissions"
Question:
a. Is this the directory shown in the associated "window?
b. Could it be a remote directory of the same server or on another server?

3.
Install Url:
"please enter the url of where Joomla will be accessible from, can be remote also if you use the ftp function below"
Question:
a. Can it be an URL where I place a Joomla installation file (zipped)?

4.
Package info:
"Choose version to install - we will attempt to download the package automatically:
Joomla existing local Joomla packages - checking existing directory :"
Question:
a. If I want to install a Joomla installation package I prepare, should I edit the v.txt file where you store the Joomla version info along with their URL's?

5. ftp
"Ftp server:
Ftp user:
Ftp pass:
Ftp path:
ftp path of where Joomla will be installed, can be remote also"
Question:
a. Is this the ftp info associated with the account I am going to install the Joomla package?

Thanks so much!