Default OS and Desktop Environment queries.

[thinkfree]

1.On my computer grub set by Fedora looks like that

# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You do not have a /boot partition. This means that
# all kernel and initrd paths are relative to /, eg.
# root (hd0,1)
# kernel /boot/vmlinuz-version ro root=/dev/sda2
# initrd /boot/initrd-version.img
#boot=/dev/sda
default=0
timeout=3
splashimage=(hd0,1)/boot/grub/splash.xpm.gz
hiddenmenu
title Fedora (2.6.25-14.fc9.i686)
root (hd0,1)
kernel /boot/vmlinuz-2.6.25-14.fc9.i686 ro root=UUID=f0e65d49-a76d-49f6-a33c-3e7474e4da3e rhgb quiet
initrd /boot/initrd-2.6.25-14.fc9.i686.img


title openSUSE
root (hd0,5)
kernel /boot/vmlinuz-2.6.22.5-31-default root=/dev/disk/by-id/scsi-SATA_ST340014A_3JXASRMJ-part6 vga=0x31a resume=/dev/sda3 splash=silent showopts
initrd /boot/initrd-2.6.22.5-31-default

How can I set OpenSuse as the default operating system?

2. During installation of fedora, I had instructed the setup to install KDE and XFCE as well with default gnome. At login screen, I get option to switch to KDE but no such option is there for XFCE. How can I use XFCE?

3. How can I make an user account default account so that it starts automatically on starting fedora?

[GNU-Fan]

1.How can I set OpenSuse as the default operating system?

Mind the line
default=0
and set it to "1".

3. How can I make an user account default account so that it starts automatically on starting fedora?

Provided that gdm is used as the login manager, on GNOME go to Desktop->Administration->Login Window and set the automatic login under the Security tab.