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Purpose of resistance between SENSE/FORCE line of power supply

I am reading through a multi-channel power supply manual and at some point it discusses the ability to chain channels in parallel to increase current output.

In the schematic, there is one resistor between sense and force line of each channel which I can't explain why it is there and what purpose it serves.

Furthermore, an amplifier symbol called "gm" is labeled as transconductor. What does it do? Transconductors are voltage-controlled current sources, but what are they doing here?

![power supply in parallel](https://electrical.codidact.com/uploads/l9wa0pozo7u2dut83ytxlf7wux01)