(still waiting for 1.2 so this refers to 1.1.3 - -PC Unmodded)
According to the description, the small Junior Docking Port allows the transfer of propellant but is too small for a snack filled Kerbal to squeeze through. If you want to transfer crew between vechiles, without going outside, you need to use the senior version of the Clamp-o-tron.
Or so I thought! But it seems vechiles that have both types of port will allow the transfer of Kerbals using the junior port. (From a vechile that only has a single junior docking port)
Does anyone know how the game decides which port can be used for personnel transfer? Some stations will allow junior port transfer and others don't and I can't work out what is making the difference.
Cheers
Clipper