This is an odd question, and I don't have a lot of information to provide but .. I recall seeing a Linux terminal that had a feature which allowed its user to choose between the options listed from a tab completion (lets say for a directory listing) by using the arrow keys on the keyboard.
And it also appeared to highlight the options from the tab completion listing as you continued to type.
So, if you tabbed completed in a directory to see the listing of files, the list would show up under where you are working and remain there .. allowing you to continue to type and then that still existent tab completion would start to highly what you have chosen before it disappeared (because you eventually chose one of the listed options)
Does anyone know what terminal this is?