What is the difference between these two declarations?

[2MuchRiceMakesMeSick]

[DllImport("user32.dll")]
public static extern int FindWindow(string lpClassName, string lpWindowName);

[DllImport("user32", EntryPoint = "FindWindowA")]
private static extern IntPtr FindWindow(
[MarshalAs(UnmanagedType.LPStr)] string lpClassName, 
[MarshalAs(UnmanagedType.LPStr)] string lpWindowName);

[2MuchRiceMakesMeSick]

The first one I understand.

The second one im not sure what these items mean
1. EntryPoint =
2. IntPtr
3. MarshalAs(UnmanagedType.LPStr)

can someone explain those three items and how they are different from the first one?

[jmcilhinney]

First stop: MSDN.

DllImportAttribute.EntryPoint field
IntPtr structure
MarshalAsAttribute class
UnmanagedType enumeration