A short video:

The master on the left, a 16F877 is telling the first 16F88 (on the top) to turn on/off the LED, and then reads 24 from it. After that, the master tells the second 16F88 (on the bottom) to turn on/off the LED, and then reads 12 from it.

It's in slow motion because I was testing everything, but I discovered that the I2C protocol is very fast!

Al, thanks a lot one more time!

Daniel.