Most of MPI’s implementations cope with the different underlying means of communication. More than just providing the ability to send a message through a certain protocol the implementations make use of specific features of a protocol to speed up message exchanging. These different communication protocols are integrated with each other and the MPI user does not and should not need to be concerned about it. However, when it comes to One Sided Communications this integration becomes more complicated. Some protocols, like TCP, do not lend themselves to One Sided Communications, while others, like shared memory, are so similar that implementation is trivial. This paper describes the issues we came across when implementing One Sided Communications for an MPI implementation with multi pluggable protocols.