Query more channels by a Rigol Oscilloscope at the same time

Hi folks, I need help to understand what can i do with my oscilloscope.

Initially I wrote the DEMO program, provides with the Oscilloscope. With this I were able to acquire data by a channel.

Now I need to acquire more channels data at the sme time, beacause I have to:

- Trigger the signal;

- compare two different signal from two different circuits that are generated at the same time.

Can I do this? I report my demo.

Thanks for you help