title: Are Independent instances of Postgresql possible
body: <p>I want to install postgresql for use as the backend to a Windows application.</p>
  
  <p>This seems to be no problem if postgresql is not already installed on the system.</p>
  
  <p>If postgresql is already installed then unless the command line parameters contain the superpassword etc of the existing installation then the install fails. 
  As I will likely never know the superpassword or other account details of any pre-existing postgresql instances and the machine owners may not either it seems that this will frustrate any attempt to install postgresql in such a situation.</p>
  
  <p>I believe it is possible to install completely independent instances of sql server but is this possible for postgresql?</p>
  
  <p><strong>BTW:</strong> 
  If the command line does contain the correct superpassword then the install just seems to overwrite the existing install and ignores parameters like --prefix etc .
  I used init db to create a new database cluster before doing a second install but this new cluster was ignored?</p>