I was in need of an IPC (Interprocess communication) between system, admin and user levels, and ended up writing this UDF to suit my wantings. Hope you find it useful too. Works from WinXP/Server2003 to the now current Win10/Server2016. It communicates between any mix of x32, x64, Admin, User. In the zip file, there is the UDF and an example: FMIPC(v0.2018.04.04).zip Special thanks to @RTFC for the help in the support forum