Sure...
If you wanted to pass, say, a username to the next page, do something like:
http://www.myserver.com/nextpage.php4?username=ralloway
On the next page, a variable, $username, will be created and 'ralloway' stored in it.
If you want to pass multiple values, do something like:
http://www.myserver.com/nextpage.php4?username=ralloway&firstname=Rich
This will create the same $username variable as well as a variable named $firstname with the value 'Rich' stored in it.
-Rich