Codes with the identifiable parent property and the multiple-access channel

The identifiable parent property has been introduced by Hollmann, van Lint, Linnartz and Tolhuizen [H.D.L. Hollmann, J.H. van Lint, J.P. Linnartz and L.M.G.M. Tolhuizen, On codes with the identifiable parent property, Preprint April 15, 1996]. We notice that its probability analogue is a coding problem for a multiple access channel and determine the capacity.