.Xclients, .xinitrc, .xsessions not read by sys what to use?

[David selby <debian@pusspaws.net>]

I run fluxbox and KDE. where can I put setup files ie xhost setup,

Most google searches suggest .Xclients, .xinitrc or .xsessions,

On debian, when booting via a graphical login manager (I use KDM) these 
do not appear to be read by the system.

Dave