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 The TDLC Frequently Asked Questions 

Compatibility

  1. What type of web browser do I need?
  2. How do I enable JavaScript?
  3. How do I enable Cookies?
  4. What if I am using a personal firewall?
  5. What if I am using America Online?
  6. How do I add TDLC as a trusted site to Internet Explorer?
  7. How do I disable caching?
  8. Why is Netscape Navigator 6.x not officially supported?
  9. How do I disable Netscape SmartDownload?
  10. Why are mathematical equations not displaying properly?

Accounts and Subscriptions

  1. What is an account?
  2. What is a subscription?
  3. Do I have to create a new account each time I want to subscribe or renew a subscription to a publication?
  4. If I have multiple accounts, can I combine their subscriptions into a single account?
  5. What happens to my progress when my free-trial-period expires?
  6. What is the price of each publication?
  7. What does a username look like?
  8. What does a password look like?
  9. How can I change my account information?
  10. Why logoff?

Errors

  1. Are your servers working?
  2. What is TDLC Error 101?
  3. What is TDLC Error 102?
  4. What is TDLC Error 103?
  5. Why did my credit card transaction fail?
 The Answers 

Compatibility

What type of web browser do I need?


TDLC requires a supported browser such as Microsoft Internet Explorer 6.x or Netscape Navigator 7.x. Netscape Navigator 6 is not officially supported.

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How do I enable JavaScript?


If JavaScript is disabled, you will be unable to use this system. To enable JavaScript, make the following change to your browser preferences:

Netscape 6.x Macintosh and PC:

  • From the Edit menu, select Preferences.
  • Click Advanced in the Category list.
  • Check the Enable JavaScript for Navigator checkbox.
  • Click OK to close the Preferences window.
  • Refresh the browser.

Netscape 7.x Macintosh (OS 9.2 and below) and PC:

  • From the Edit menu, select Preferences.
  • Click the arrow next to Advanced in the Category list.
  • Click Scripts & Plugins.
  • Check the Navigator checkbox under Enable Javascript for.
  • Click OK to accept the new settings and leave the Preferences window.
  • Refresh the browser.

Netscape 7.x Macintosh (OS X):

  • From the Netscape menu, select Preferences.
  • Click the arrow next to Advanced in the Category list.
  • Click Scripts & Plugins.
  • Check the Navigator checkbox under Enable Javascript for.
  • Click OK to accept the new settings and leave the Preferences window.
  • Refresh the browser.

Internet Explorer 5.x PC:

  • From the Tools menu, select Internet Options.
  • On the Security tab, click the Internet zone to make sure it is selected.
  • Click Custom Level to open the Security Settings window.
  • Scroll down to Active scripting in the list of options and click the Enable button.
  • Click OK to accept these new settings.
  • Click Yes on the alert box.
  • Click OK to close the Internet Options box.
  • Refresh the browser.

Internet Explorer 5.1 Macintosh:

  • From the Edit menu, select Preferences.
  • Choose Web Content from the Web Browser list.
  • In the Active Content section, make sure that the Enable Scripting checkbox is checked.
  • Click OK.
  • Refresh the browser.

Internet Explorer 5.2 Macintosh:

  • From the Explorer menu, select Preferences.
  • Choose Web Content from the Web Browser list.
  • In the Active Content section, make sure that the Enable Scripting checkbox is checked.
  • Click OK.
  • Refresh the browser.

Internet Explorer 5.x - 4.x Macintosh:

  • Select Preferences from the Edit menu.
  • Select Web Content from the Category list.
  • Check the Enable Scripting checkbox in the Active Content pane.
  • Click OK to close the Preferences window.
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How do I enable Cookies?


If Cookies are disabled or rejected, you will be unable to use this system. To enable Cookies, make the following change to your browser preferences:

Netscape 6.x Macintosh and PC:

  • From the Edit menu, select Preferences.
  • Click Cookies.
  • Click the button for Enable All Cookies.
  • Click OK.
  • Refresh the browser.

Netscape 7.x Macintosh and PC:

  • From the Edit menu, select Preferences.
  • Click the arrow next to Privacy & and Security in the Category list.
  • Click Cookies.
  • Click the button for Enable All Cookies.
  • Click OK.
  • Refresh the browser.

Internet Explorer 5.x PC:

  • From the Tools menu, select Internet Options.
  • On the Security tab, click the Internet Zone icon.
  • Click Custom Level.
  • Scroll down to the Cookies category.
  • Click the Enable buttons under Allow cookies that are stored on your computer and Allow per-session cookies (not stored).
  • Click OK.
  • Click Yes.
  • Click OK.
  • Refresh the browser.

Internet Explorer 6.x PC:

  • From the Tools menu, select Internet Options.
  • On the Privacy tab, click the Advanced button.
  • Check the Override automatic Cookie handling checkbox ifi t is not checked.
  • Click the Accept button under First-party Cookies.
  • Click OK.
  • Click OK.
  • Refresh the browser.

Internet Explorer 5.x - 4.x Macintosh:

  • From the Edit menu, select Preferences.
  • Click Cookies under Receiving Files.
  • In the When receving cookies drop-down menu, highlight Never ask.
  • Click OK.
  • Refresh the browser.

Internet Explorer 5.2 Macintosh:

  • From the Explorer menu, choose Preferences.
  • Click Cookies under Receiving Files.
  • In the When receving cookies drop-down menu, highlight Never ask.
  • Click OK.
  • Refresh the browser.
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What if I am using a personal firewall?


Some personal firewalls, including ad-blocking and script-blocking software, are incompatible with the TDLC subscription system.

If you cannot access our site unless you turn off your personal firewall, the problem is the settings of your software. Please refer to the documentation that came with your software, paying close attention to the following subjects: Cookies, JavaScript, and Pop-up Windows.

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What if I am using America Online?


America Online's built-in web browser is incompatible with the TDLC subscription system.

AOL Version 9.0 and above lets you run third-party Internet applications over your AOL Internet connection. Download, install, and use a current version of either Microsoft Internet Explorer or Netscape Navigator to access this site.

You can use Internet Explorer or Netscape Navigator by simply connecting to America Online the way you normally do, and then starting the other application.

For more information, Macintosh users should go to Keyword: AOLLink. Windows users should go to Keyword: Winsock.

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How do I add TDLC as a trusted site to Internet Explorer?


Some administrators have instructed their users to turn off Active Scripting in Internet Explorer for security reasons. However, TDLC requires Active Scripting to ensure its own security. You can comply with both needs in Internet Explorer by adding TDLC as a trusted site. Active Scripting will remain disabled for any non-trusted sites.

Internet Explorer 6.x - 5.x PC:

  • From the Tools menu, choose Internet Options....
  • From the Internet Options dialog, choose the Security tab.
  • In the selection box labeled Select a Web content zone to specify its security settings choose the icon labeled Trusted sites.
  • Choose the Sites... button. You should now see the Trusted Sites dialog.
  • Make sure the Require server verification (https:) for all sites in this zone check box is clear.
  • In the Add this Web site to the zone text box, type *.tdlc.com and choose the Add button. You should now see the text *.tdlc.com in the Web Sites list box. Choose the OK button to save the new setting.
  • You should be back to the Security tab on the Internet Options dialog. Choose the Custom Level... button. You should now see the Security Settings dialog.
  • In the Settings list box, under the heading Active Scripting, choose the Enable radio button. Choose the OK button to save the new setting.
  • You should be back to the Security tab on the Internet Options dialog. Choose the OK button to save your new settings.
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How do I disable caching?


Some proxy servers, including America Online's proxy servers, often incorrectly cache web pages. To prevent this, make the following change to your browser preferences:

Netscape 7.x - 6.x Macintosh and PC:

  • From the Edit menu, select Preferences.
  • Click the arrow next to Advanced in the Category list.
  • Click Cache.
  • set the Compare the page in the cache to the page on the network radio button to Every visit to the page.
  • Click OK to close the Preferences window.

Internet Explorer 6.x - 5.x PC:

  • Select Internet Options from the Tools menu.
  • Click the Settings button in the Temporary Internet Files pane.
  • Set the Check for newer version of stored pages radio button to Every visit to the page.
  • Click OK to close the Temporary Internet Files window.
  • Click OK again to close the Internet Options window.

Internet Explorer 5.x - 4.x Macintosh:

  • Select Preferences from the Edit menu.
  • Select Web Browser from the Category list.
  • Select Advanced from the Web Browser category.
  • Set the Update pages radio button in the Cache pane to Always.
  • Click OK to close the Preferences window.
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Why is Netscape Navigator 6.x not officially supported?


Netscape Navigator 6.x is not officially supported because, it fails to comply with current web browser standards.

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How do I disable Netscape SmartDownload?

If SmartDownload starts when you download a file, and you have problems downloading, click the Advanced button in the SmartDownload dialog box and disable SmartDownload, then try downloading the file again.

Or, click the Windows Start Menu, select Programs, Netscape SmartDownload, and Disable SmartDownload.

For more information, please read the Netscape SmartDownload FAQ.

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Why are mathematical equations not displaying properly?


Some of our publications require special mathematical fonts.

For more information, please view the TDLC Font Test.

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Accounts and Subscriptions

What is an account?


An account is created the first time you subscribe to a publication. An account is basically a method of gaining access to your subscriptions. Each user should have only one account, but each account may have many subscriptions.

After your account has been created, you will receive a username and password which will give you the ability to logon to TDLC.

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What is a subscription?


A subscription is basically a method of gaining access to a specific publication for a specified period of time.

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Do I have to create a new account each time I want to subscribe or renew a subscription to a publication?


No.

Each user should have only one account, but each account may have many subscriptions. After your account has been created, it can be used to subscribe to any number of publications.

To subscribe to a new publication, logon to TDLC with your username and password, click on Products or Subscribe, then click on the Subscribe link below the publication.

To renew a subscription, logon to TDLC with your username and password, then click on the Renew link below the subscription in your Subscription List.

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If I have multiple accounts, can I combine their subscriptions into a single account?


Subscribers do not have the ability to combine multiple subscriptions into a single account on their own.

Contact us for details.

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What happens to my progress when my free-trial-period expires?


Work that is completed during a free-trial-period is kept after the free-trial-period expires. After your trial period has expired, you may renew your subscription to that publication, enabling you to pick up where you left off.

Note that you may not subscribe to more than one free-trial-period per publication.

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What is the price of each subscription?


To find the subscription prices of each publication, click the Products or Subscribe link, click on the Subscribe link below the publication, then click on the Purchase Online link.

If you still have questions, please contact the publisher of that publication.

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What does a username look like?


A username consists of a few letters, followed by several numbers. The letters include your initials.

Example for John Doe: jxd111

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What does a password look like?


A password initially consists of a combination of seven random (non-deterministic) letters and numbers.

Example: qw123er

You can change your password after you logon. Click here for details.

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How can I change my account information?


To change your account information, logon to TDLC with your username and password, and then click on Change Password or Modify Account.

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Why logoff?


Logging off is important to the security of your account and subscriptions for the following reasons:

  • It guarantees that our systems will properly save your progress.
  • It prevents anyone else from accessing your account information (including your password) from your workstation.

Users are automatically logged off after a six-hour period. At that time, our systems will attempt to save your progress without your assistance

Note that this does not mean your account information or progress was protected while you were away.

Therefore, it is always best to make a habit of logging off before leaving your workstation.

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Errors

Are your servers working?


You can check the status of our servers using our maintenance history page.

What is TDLC Error 101?


You are not logged on. This error may have been caused by the following:

  • You have tried to access your subscription without logging on.

    Solution: logon. Go to http://www.tdlc.com/ and logon. After you have logged on, use your Subscription List to access your subscription.

  • Cookies have been disabled. We use cookies to remember your logon.

    Solution: enable cookies. Click here for instructions on enabling cookies. Then go to http://www.tdlc.com/ and logon. After you have logged on, use your Subscription List to access your subscription.

  • Your web browser has incorrectly cached a page.

    Solution: disable caching. Click here for instructions on disable caching. Then restart your computer. Go to http://www.tdlc.com/ and logon. After you have logged on, use your Subscription List to access your subscription.

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What is TDLC Error 102?


This error occurs when you continue to attempt to access a subscription after receiving a TDLC Error 101.

Solution: resolve TDLC Error 101 first. Click here for instructions.

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What is TDLC Error 103?


You logon cookie is invalid. This error may have been caused by the following:

  • Your cookie has been damaged.
  • Your cookie has been modified.

Solution: logon again. Go to http://www.tdlc.com/ and logon. After you have logged on, use your Subscription List to access your subscription. If the error continues, contact your network administrator.

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Why did my credit card transaction fail?


This error may have been caused by the following:

  • Your bank declined the credit card transaction.

    Solution: since we do not have access to your bank account information, contact your bank for details. Then logon and subscribe again.

  • Our bank declined the credit card transaction.

    Solution: verify your credit card number, expiration date, cardholder name and address. Then logon and subscribe again.

  • Our bank was unable to be contact your bank in order to process a transaction. If our bank cannot contact your bank, we cannot execute a transaction.

    Solution: wait three hours. Then logon and subscribe again.

In any case, do not try to subscribe more than three times per twenty-four-hour period. Too many unsuccessful transactions may lead your bank to believe a fraudulent act is occurring. This may lead your bank to lock your credit card account.

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