read and write PDOS question

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i have read the basic.py and minimal.py. based on my coding level, i'm still confusing, hers is some question hope someone can help
1.for master.config_map() , slave.input and slave.output are the pdo data that mapped?
2.for master.send_processdata() and master.receive_processdata(), is slave.input and slave.output are the data that sending and receiving?
3. to write a PDO mapping, is it correct that using SDO?

[GoesWithoutSaying]

problem solved.
slave.input represent input data from slave
slave.output represent output data to slave
to send processdata,
slave.output = bytes([data1, data2])
master.send_processdata()
to read received process data
master.receive_processdata()
input_from_slave = slave.input
print(input_from_slave)