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Help with Hserin/Hserout commands?

I have 2 Picaxe 28x1's that will need to communicate serially with one another while each performing tasks such as PWM, reading ADC, simple outputs. As I understand, the Hserin and Hserout pins/commands allow the Picaxes to recieve serial data in the background, store it somewhere, and read the stored data whenever necessary. I need Picaxe A to do tasks, and then send 2 variables to Picaxe B without interupting B's program flow. B needs to be able to look up the variable sent from A whenever necessary and continue on. How would I connect the 2 Hserin/Hserout pairs on each Picaxe?