Hi,

Yes, you can modify for example Smart search box web part (~\CMSWebParts\SmartSearch\SearchBox.ascx) for this purpose, where you will integrate the 3rd party "auto suggest" feature.

I’m not familiar with the 3rd party control, but I assume that auto texts are taken from some database tables or from some external file. So, you would also need to track previous user inserted texts (in code behind of the web part) and store them somewhere in order to be able to use them in your custom control for future usage.

Best regards,
Miroslav Remias.