What's the system account to run ASP.NET web app for each sites in IIS with different application pool?

Question

Suppose I have many different website created on IIS 7 on Windows 2008 R2. Each of them may have different application pool:

.NET 1.1
.NET 2.0
.NET 3.5
.NET 4.0

What the system account to run all those web app? If the app need to read/write file, need to set up right permission for specific folder, then how can I identify the right account to assign right permission?

Answer 1

Each application pool can execute as a specific user to control this do the following:

1. Click on Application Pools in IIS Manager
2. Click Advanced Settings
3. Find the Identity property and click the ellipsis
4. Select the Custom Account radio button
5. Enter the user name and password

In step 5 be sure to include the domain name as in: MyDomain\UserName