There're 11 tabs on the Options dialog box. Here's a description of options on each tab.

On the Connection tab, you can set:

Error Handling: How many times to retry on network errors, and delay between retries.
Timeout: How many seconds to wait for server response before treat it as an connection problem.
Limit: Max number of running jobs
Bandwidth: Speed limit and adjustment values. See traffic regulation for details.

On the Job default tab, you can set:

Default Directory: Where to put downloaded files, if no matching category is defined.
Authentication: Default username and password for login (usually anonymous).
Miscellaneous: Set number of ants for a single job. And determine if a job is started immediately when added.

On the Automation tab, you can set:

Browser click capture: Capture clicks on certain type of URLs.
Clipboard monitor: Monitor clipboard for certain type of URLs
Virus scan: Automatically scan downloaded file using the virus scanner specified here.

On the Proxy tab, you can define a list of proxies for selection while downloading files. By clicking the "Add" or "Edit" button, you will see a dialog box to define the proxy type, address, port, authentication (optional), and assign a name to the proxy that will appear in the proxy list drop down box on the "Add Job" dialog box.

NetAnts support many types of proxies. For more discussions on Proxy, click here.

On the Dial-Up tab, you can set:

Dial-Up Networking: Choose the connection you used to connect your computer to the Internet. NetAnts Dialer is an interface to the Windows DUN facility. If you prefer, you can setup your connection in Windows Internet Options, that will be perfectly ok with NetAnts.

If you leave the username and password fields blank, NetAnts will fetch these from the last-used DUN entry of the operating system.

On the Schedule tab, you can set:

Download schedule: Start download at the given time.
Hang up schedule: Hang up at the given time.

You can also enable/disable scheduling using the toolbar. But time can only be set here.

On the Save To tab, you can set:

Categorization: Categorize downloaded files based on their extension. If a file's extension can not match any categories defined here, it is put under the default directory (see Job default section above).

On the Protocol tab, you can set:

HTTP Protocol: Referrer and User-Agent. These settings are used by the web server. Do not change these if you don't know what it is.
FTP Protocol: PASV mode and ASCII mode. Please leave these settings as their default value, unless instructed by technical support or your network administrator. Hint: set/unset the PASV mode will affect your connctivity if you are behind a firewall.

On the Advanced tab, you can set:

Start all jobs after running.
Always show add job dialog.
Stop if server doesn't support resume.
Use cookies from browser: Use login information found in your browser's cookies.
Auto save job: Flush data in memory to disk. It is recommended that this value be set as small as possible, to preserve downloaded data in case of system failure.
Get file date and time from server: Use date/time information from the server instead of local date/time.
Create .NFO file: The .NFO file is a log file that recorded information about the downloaded file.
Delete job from list after complete: Job entries will be deleted after complete. If you need to keep a download history, update or re-download the file, you should uncheck this option.
Winpopup message notification to: Send a popup notification when job is completed. Need the winpopup program to operate.
Show notification message: Popup a window to notify you on job completion. The popup is generated by NetAnts and do not need winpopup.
Use Sounds: Use sound notification on job add, job complete and in case of error.
Hang up after done downloading.
Exit after done downloading.
Shutdown after done downloading.

The last 3 automation features can be toggled on the toolbar.