How I did it in 4 minutes: Multisite, same codebase and database on 1 and 1

I thought I'd post this here just in case this helps someone. I also suspect some can add to this post and do things a little more neatly than I did.

Objective
To install latest drupal 6 ver on 1and1 shared hosting for two different domains off the same code base and the same database. I know some may be thinking this might be an odd thing to do from a performance or capacity point of view (1and1 limit dBs to 100 MB), but it may work very well for small-ish not so busy sites or super performing hosting providers.

1. Install drupal as per normal instructions
   For 1and 1 make sure you are using php5 and you uncomment "# RewriteBase /" in .htaccess file to enable clean urls. An excellent guide on this and other drupal tricks can be found at http://www.sitetrick.com/

   Also, during the installation you can opt to give the table names a prefix (e.g. "domain1_"). This step makes it easier to identify tables or potential maintenance issues.

2. Point your second domainname (say domainname2) to the dir where drupal is installed
   This is very easy with 1and1. Simply navigate to where your domains can be listed and modify the web space for the chosen domain. No symbolic links required.
3. Copy sites/default folder to sites/domainname2
   Use the actual domainname2 - ie. www.domainname2.tld.
4. Edit the sites/domainname2/settings.php file
   The **only** edit required here is to change the line
   $db_prefix = 'domain1_'; to $db_prefix = 'domain2_';
5. Run install.php script on second site using www.domainname2.tld or http://domainname2.tld
   Both access methods worked for me. As we're using the same database with the username and PW in the settings.php file the installation zooms through.

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Well that's it. You can install as many sites as you dare from the same code base and using the same database - so easy.