改变默认的window manager?

1.在slackware9.1下怎样将 GDM 登录 改为 KDM 登录
edit /etc/rc.d/rc.4

change the following lines:

# Try to use GNOME's gdm session manager:
if [ -x /usr/bin/gdm ]; then
exec /usr/bin/gdm -nodaemon
fi

TO:
# Try to use GNOME's gdm session manager:
#if [ -x /usr/bin/gdm ]; then
# exec /usr/bin/gdm -nodaemon
#fi
2.修改什么文件改变默认的window manager?
运行xwmconfig
比如你要使用gnome
$ vi ~/.xinitrc
exec gnome-session

你要使用kde
$ vi ~/.xinitrc
exec startkde

你要使用WindowMaker
$ vi ~/.xinitrc
exec wmaker