How can PHP users ensure they have the necessary write permissions on Windows 2000 and IIS?

PHP users can ensure they have the necessary write permissions on Windows 2000 and IIS by checking the permissions of the directory where they want to write files and ensuring that the IIS user (typically IUSR_MACHINENAME) has write permissions. They can also explicitly set the permissions using the `icacls` command in the command prompt.

// Example code to set write permissions on a directory for IIS user
exec("icacls C:\\path\\to\\directory /grant IUSR:M");