Well, if you look at the Parampractice parameter, and edit it, you will see that there are 4 settings:
Name: Parampractice
Type: Integer
Default Value: -1
Runtime Value: $_GET['practice_id']
what this means is:
If a querystring variable is passed in named "practice_id", the Parampractice parameter is assigned that. Otherwise the default value is used.
Example:
access the page as:
practice_Detail.php?practice_id=23
will cause the parameter in the recordset to be assigned the value 23.