How to find the worker process aka w3wp.exe running for ur Sharepoint Web application

This post has to be modified for IIS 6.

When you require the need of attaching your webpart debugger to the current running instance of W3WP process container for your SharePoint application from Visual Studio, you find only the ID for the W3wp currently running in the server.
To identify the current running worker process in IIS 7.0 for your application to debug under VS 2005 or VS2008.

IIS 7.0 has a wonder administration tool called appcmd.exe from which every tasks for maintaining IIS can be batched process using this command tool.
Located in %systemroot%\system32\inetsrv\

Now to display the list of web application running under W3WP process run appcmd with this parameters:
C:\Windows\System32\inetsrv>appcmd list wp
you will see

WP "4900" (applicationPool:Portal)
WP "4540" (applicationPool:TimeSheet9898)
WP "3600" (applicationPool:SharePoint Central Administration v3)


for IIS 6.0 I'll post later.