This is not my code, but I'll be darned if I can 
find the original email I got it from so I can 
give proper credit. This is a way to open or 
close the CD drawer from DOS. Well, more 
properly, from QBASIC. QBASIC is free with every 
version of DOS (even though you may not have 
installed QBASIC when you installed Windows!) 
and is a free download as well. I give several 
links telling where to find QBASIC here: 
http://www.ericphelps.com/batch/basics/index.htm

Opening or closing a CD with QBASIC is a two-line 
operation. Both require the name of the CD driver 
under DOS. You can find this by looking in your 
C:\CONFIG.SYS file. There should be a line that 
will look something like this:
DEVICE = C:\BLAH\BLAH\CD_DRIVER.SYS /D:MSCD0000
What we are looking for is everything after the 
"/D:" and up to the next space. In the above 
example, the CD driver name would be "MSCD0000". 
If you have more than one line with a /D: on it, 
look for a name of the SYS file (CD_DRIVER.SYS 
in the above example) that has a name based on 
your CD manufacturer's name. Like maybe "TOSHCD" 
if your CD was made by Toshiba. You get the idea. 
In all the code below, you'll see "MSCD0000", but 
you should replace that with the actual name of 
the CD driver on your system.

I've wrapped the QBASIC code in a batch file to 
make it a bit easier to use. To open a CD from a 
batch file:

echo OPEN "MSCD0000" FOR OUTPUT AS #1> %TEMP%\CD.BAS
echo IOCTL #1, CHR$(0)>> %TEMP%\CD.BAS
echo SYSTEM>> %TEMP%\CD.BAS
QBASIC /RUN %TEMP%\CD.BAS
DEL %TEMP%\CD.BAS

To close a CD from a batch file:

echo OPEN "MSCD0000" FOR OUTPUT AS #1> %TEMP%\CD.BAS
echo IOCTL #1, CHR$(5)>> %TEMP%\CD.BAS
echo SYSTEM>> %TEMP%\CD.BAS
QBASIC /RUN %TEMP%\CD.BAS
DEL %TEMP%\CD.BAS