How do I prevent multiple registrants from overwriting each other's cookies?

Here’s the problem:
1 household, multiple users who don’t log on or off. They are learning different languages. They come to the site to register and the registration part works fine. But, because they don't properly logon and off, the cookies that are set by the first registrant are overwritten by the second and so on. When someone returns to the site, the cookies set by the second or third registrant would take the 1st registrant to the wrong login page. Is there a standard solution for this (seemingly) obvious problem?
Any ideas like:
<?php if (isset) $_COOKIE[‘targ_lang’]; {
Rename this.new $_COOKIE['targ_lang'] to $_COOKIE[‘targ_lang2’];
?>
I could then read the cookies on the index.php with:
<?php if (isset) $_COOKIE[‘targ_lang’] and (isset) $_COOKIE [‘targ_lang2’] {
header('Location: http://www.xxx.com/a_page_displaying_both their_languages.php');
?>
That page would have a
Select your language:
<a href"http://www.xxx.com/Login/<?php echo $_COOKIE['targ_lang']; ?>.php"><?php echo $_COOKIE['targ_lang']; ?></a>
or:
<a href"http://www.xxx.com/Login/<?php echo $_COOKIE['targ_lang']; ?>.php"><?php echo $_COOKIE['targ_lang']; ?></a>
They could select their language and then go to the proper login page.
Bearing in mine my inexact syntax, does that make sense and does it look like it would work?
Or, back to my original question, is there a really obvious solution to the multiple user problem I'm overlooking? (as usual)
As always,
Thanks for your help.
Brian

Can a cookie name be set dynamically like that?
So that I could have multiple users on a computer who don't log out?
<?php setcookie("first_name", French, time(0)+3600, "/", ".cinelingua.com");
?>
So first_name would be set from the registration page input field for First
Name?
That would be really cool. What does that look like?

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Don't tell God how big your storm is. Tell the storm how big your God is!
From: Pat Willener <[email protected]>
To: Debbie Fisher <[email protected]>
Sent: Wednesday, October 8, 2014 12:56 AM
Subject: how do i move multiple files from acrobat.com to my pc?
how do i move multiple files from acrobat.com to my pc?
created by Pat Willener in Adobe acrobat.com services - View the full discussionActually, if you go to https://cloud.acrobat.com/files you can check the checkboxes on the left of your files list, then click on the Download button to download multiple files. https://forums.adobe.com/servlet/JiveServlet/downloadImage/2-6802984-681636/900-380/acroba t.com.png Please note that the Adobe Forums do not accept email attachments. If you want to embed a screen image in your message please visit the thread in the forum to embed the image at https://forums.adobe.com/message/6802984#6802984 Replies to this message go to everyone subscribed to this thread, not directly to the person who posted the message. To post a reply, either reply to this email or visit the message page: To unsubscribe from this thread, please visit the message page at . In the Actions box on the right, click the Stop Email Notifications link. Start a new discussion in Adobe acrobat.com services by email or at Adobe Community For more information about maintaining your forum email notifications please go to http://forums.adobe.com/thread/416458?tstart=0.

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