To set up an internal campaign just go to Settings > Campaigns & Ad Channel > Manage Internal Campaigns and click on the Add new internal campaign button.
The setup page for an internal campaign contains a suggested URL pattern that you can use to identify your campaign. This pattern contains the _s_icmp variable by default and an automatically generated string. Please note that the _s_icmp variable is case sensitive.
If you want to identify your internal campaigns with descriptive URL strings (e.g., leftbanner), you can do so by clicking on the Change link and filling in the string of your choice. This also allows you to change the URL string in the unlikely event that there might be a conflict between the string automatically generated and another string used on your web site. Once you decided what URL string to use, click on the Add button and your internal campaign will be saved. Please make sure that you add the same URL string to your web site in order to identify the campaign.