Once when I was a gabbai in a very small jewish community, we had two cohanim: one was our Rabbi and usually I gave him an aliya l'torah -called him up for a torah reading. The other was secular and ...
On Shabbat, the gabbai calls the kohen to the Torah with the following formula: ויעזור ויגן ויושיע לכל החוסים בו ונאמר אמן. הכל הבו גודל... I have never heard anyone say amen after the prompt. ...
When people are called up to the Torah by name, often there is a title that goes with them, such as "ha-bachur" for a young man, "ha-rav" for a rabbi (and/or someone with semicha), and other such ...