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Have you ever type "ls" in your window's command prompt?
To emulate some very Linux (or Unix) comands under MS-DOS (command prompt), you can create the a file called "unix.bat" in "C:\" with the commands below

@echo off
doskey time=time /t
doskey date=date /t
doskey lt=dir /w
doskey ls=dir
doskey pwd=cd
doskey clear=cls
doskey man=help
doskey ifconfig=ipconfig
doskey alias=doskey /m
doskey cd=cd 

VM ware has released a free virtual machine player (VMplayer) at http://www.vmware.com/products/player/. That's a great option if you run Linux and do not want to have to reboot your computer each time you need to use a MS-Windows only application!
You can find my vmx file here. To create your disk file you can download Qemu-img. Then create your disk image by typing:
> ./qemu-img create -f vmdk win.vmdk 4000M
Note: If you want to be able to store/move your file on a VFAT partition, do not create files bigger than 4000M as such files can not be stored on a VFAT partition.

One of the problems with this solution is that from time to time my MS-Windows virtual machine crahses (normal, it's a Microsoft product!) and that freezes my keyboard so that I have to reboot my physical computer (not the VM only!).
(6/6/2006): Update on the crashes: They seem to occur because my VM Hard drive file is on a FAT32 filesystem limited to 4 GB.
Solution: I have set a quota on my hard drive to limit its growth to 3.5GB (File explorer/right click on your disk /quotas) and added a second "VM drive".
To add a second drive, create a drive file with qemu and add the following lines in your vmx file:
ide0:1.present = "TRUE"
ide0:1.filename = "disk2.vmdk"
ide0:1.deviceType = "disk"
ide0:1.startConnected = "TRUE"
The start your virtual machine and initialize the disk: Control Panel/Administrative Tools/Computer Management/
For your data you can also use a network partition exported from your linux drive with Samba (but it seems to slow significantly the startup process if you ask for this partition to reconnect at logon).

Here is a way to upgrade SL with yum (see ref here for 4.1):

First you need to update your yum settings. The up-to-date settings for 4.2 can be found at ftp://ftp.scientificlinux.org/linux/scientific/42/i386/SL/RPMS/
Package:
ftp://ftp.scientificlinux.org/linux/scientific/42/i386/SL/RPMS/yum-conf-42-3.SL.noarch.rpm

Then install the package:
rpm -Uvh ftp://ftp.scientificlinux.org/linux/scientific/42/i386/SL/RPMS/yum-conf-42-3.SL.noarch.rpm

Then
yum upgrade yum
yum upgrade


And that's it...

It takes a few hour (over a fest connection) to download the full upgrade (440 Mb for me!).


Note: This does not work to upgrade from SL 3.x but it should work to upgrade from 4.0.

If you want to use a bluetooth headset with linux, I recommend that you read:

• http://bluetooth-alsa.sourceforge.net/
• http://www.linux.ie/articles/bluetoothheadset.php

• When you try to pair your computer check that bluetooth is enable and that the deamon has been started (this is not done by default on some distros)
  If you get a message like:
  >hcitool scan
  Device is not available: Success
  You should try to start bluetooth again:
  /etc/init.d/bluetooth start
  
  Once bluetooth is started, to find the hardware address of your device (in pairing mode) use:
  >hcitool scan
  It should return:
  Scanning ...
         00:07:A4:23:XX:XX       Jabra BT 250v
  
  Then you can pair it by typing:
  >hcitool cc 00:07:A4:23:XX:XX
  
• The next step is to install btsco and the kernel module snd_bt_sco.
  
  • When you download the sources of btsco (At: http://sourceforge.net/project/showfiles.php?group_id=116589), check the kernel version. If the compilation of the kernel module fails witout explanation, it might be that the module requires a more recent kernel than yours.
  • After compiling and installing the module, you need to refresh your modules list by typing:
    >depmod -ae
    >modprobe snd_bt_sco
    
    If the compilation/installation is successful but you get the error:
    >modprobe snd_bt_sco
    FATAL: Module snd_bt_sco not found.
    It probably means that you forgot to type:
    >depmod -ae
    
    Once this is done you can start btsco:
    >btsco -v 00:07:A4:23:XX:XX
    (and then start skype in another terminal)
    
  • Summary (once everything is installed):
    
    • To connect your handset type (in pairing mode):
      >/etc/init.d/bluetooth start
      >hcitool scan
      >hcitool cc 00:07:A4:23:XX:XX
      >btsco -v 00:07:A4:23:XX:XX
      You are ready to use your handset...