So you're in a science fiction scene

What would you do if when you were on a beach (a warm, comfortable beach) exploring caves, you found one with a door. To a bright, white room. The light pouring strangely into the dark cave. Intruding. Pulling you aross from rock through door to white. What if you then walked inside. Into a room as wide as it is tall, and as high as it is deep. A comfortably small room.

So now you look around the room. "Huh, nothing anywhere" you think or mabe say. Not long passes, about as long as to read this, and over there: a mechanical wirring arm. Pulling from the wall and presenting a half-egg-shaped platform. The size of a book. Worthy of Wally's "Eeeva." Now you look down. Here is a petite screen, with keyboard below. Just the typewriter keys, no alt or ctrl options showing. In the upper left corner, you can't help but notice the cursor, blinking, waiting. The screen is black. The cursor is orange. Blinking. What do you do? Okay, after you look over everything, and see no wires, or openings or clues, just the blinking cursor. Blinking. Blinking. What do you do?