When I was in 5th grade, my school had bought few computers (I don't remember on which OS they were running back in 1999) and they'd installed Logo on it.

For those who are not familiar with Logo, it was a programming language for educational purpose. The main highlight of this programming language was, it had a graphical on-screen cursor called "Turtle". Users had to type in commands to make this cursor move on the screen. Like "Right 90" would turn the cursor by 90 degrees.

This was my first official exposure to a computer.