kdesktoplockcontrol can never work

Hi all, during the research around kdesktop_lock I found that kdesktoplockcontrol (formerly pipe, now socket) can never work. Pipe / socket is created in folder /tmp/tdesocket-global, but into this folder can enter and write only 'root'. The folder is created with permissions 0644, which is a bit unusual for the folders. I also noticed (when I was allowed to write to the folder tdesocket-global also for others) that kdesktoplockcontrol and kdesktoplockcontrol_out are created but never removed. Please can anyone confirm my findings? How kdesktoplockcontrol was intended? Currently obviously can never work. Slavek