it makes a lot of difference to the host sending the data. for instance, pcanywhere:
pcanywhere uses UDP to send the status to the host indicating that it is still functioning properly. UDP doesn't require a response back from the remote client. it assumes that the data is making contact. however it uses TCP in order to send the data (screen refresh). if the remote administration pc doesn't respond to the screen refreshes then the host will assume that the connection speed needs to be altered or the connection was lost.