Confusion about function parameters

Projects LimeSDR
1

Hello everyone,

                          I am referring to the functions described here:  
                          https://docs.myriadrf.org/LMS_API/modules.html

                         Now some of the function descriptions explicitly mention whether a parameter is "IN" 
                         or  "OUT", and some don't!!

                         Am i to understand that when this IS made EXPLICIT, there DO exist "OUT"  parameters 
                         and when it is NOT made EXPLICIT, there DO NOT exist "OUT" parameters ??

                        Also there is the return parameter. Is this always one of the OUT parameters???

                        Then again, in what order (left to right) do we collect and also supply various 
                        parameters?

                       Can someone shed light on these matters??

Thanks a lot