You can add a search box to your institution’s website that is limited to your content in the OAC, by copying an HTML snippet that's available through your OAC Dashboard -- and incorporating it into your site.

Here's an example snippet:

<form action="http://www.oac.cdlib.org/search">
<input maxlength="80" 
       size="30" 
       name="query" 
       type="text">
<input type="submit" 
       value="go" 
       style="background: #B24415; 
       color: #fff; padding:2px;">
<input value="California Historical Society" 
       name="institution" 
       type="hidden">
</form>

You can see it in action on the California Historical Society's website.