The invention is in the field of medical fluid management machines, in particular dialysis machines. The invention is based on the problem of expanding the input and output devices of medical fluid management machines and creating alternative possibilities for monitoring medical fluid management machines or treatments performed using such machines. In accordance with the teaching disclosed, this problem is solved by the fact that mobile computers such as tablet PCs or smartphones can be connected mechanically to the medical fluid management machines, and there is a data transmission between the medical fluid management machine and the mobile communication device or mobile computer leading to the display of information pertaining to the medical fluid management machine or a treatment performed using this device on the display unit of the mobile communication device or the mobile computer. In addition, it is proposed that sensors of the mobile computer should be used for monitoring and/or controlling the medical fluid management machine or a treatment performed using the same.