Winpopup client

Hi list, sending popup messages to Windoze machines is not a problem (smbclient works just great) but when a Windoze User wants/needs to contact me using such tool (WinPopup) they just fail because, AFAIK, there's no way to receive and show them on Linux. I already tried LinPopup and popper: the former can send messages but it doesn't receive them, and the latter crashes just after starting (I'm using the popper which comes on the SuSE 9.0 Pro CDs) Any other suggestions are welcomed! Martin