[NTG-context] Displaying text on a page in several steps

I want to have several points on a page, but have them displayed one after the other. For example, the complete page is: MY POINTS 1. The first point 2. The second point 3. The third point 4. The fourth point Initially you see: MY POINTS 1. The first point After giving space you see: MY POINTS 1. The first point 2. The second point When giving again space, you see: MY POINTS 1. The first point 2. The second point 3. The third point And another space gives: MY POINTS 1. The first point 2. The second point 3. The third point 4. The fourth point Is this possible? -- Cecil Westerhof