Xfce and arch
 

How can i make xfce autostart without a login manager in Arch?

Do you want to login first? Or should the system go straight to the desktop when booting?

Just start the X-server with the correct arguments. (Look at /etc/X11/xinit.rc - or a similar location/name - for examples.) Or look at how the startxfce4 program does it after it's invoked by the login application. (Usually in /usr/bin/startxfce4, but it is a shell script you can cat.)

Note that you still need a display manager (usually gdm or kdm) started by the X-server that invokes the startxfce4 script. That's all the "login manager" does, although that's just a program being run by the display manager, not an actual "manager" like, for example, kdm. (I.e, what do you hope to gain by not running that [minor] application? :scratch:)

If you want to avoid the "bother" of logging in, then just set your userid for automatic login.