Sorry, but that's wrong. At least under NT4 (and higher), the following behaviour holds :

S:\Systeme_Projekte\Ism\Maischein>cd
S:\Systeme_Projekte\Ism\Maischein

S:\Systeme_Projekte\Ism\Maischein>cd c:
C:\TEMP

S:\Systeme_Projekte\Ism\Maischein>cd c:\winnt

S:\Systeme_Projekte\Ism\Maischein>cd
S:\Systeme_Projekte\Ism\Maischein

S:\Systeme_Projekte\Ism\Maischein>cd c:
C:\WINNT

S:\Systeme_Projekte\Ism\Maischein>cd /d c:\winnt

C:\WINNT>
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The cd command without any parameter outputs the "current directory".

The cd drive: command outputs the "current directory of the drive".

The cd drive:\path command changes the "current directory of the drive".

The /d option also changes the current drive.

perl -MHTTP::Daemon -MHTTP::Response -MLWP::Simple -e ' ;    # The  
$d = new HTTP::Daemon and fork and getprint $d->url and exit;#spider
($c = $d->accept())->get_request(); $c->send_response( new   #in the
HTTP::Response(200,$_,$_,qq(Just another Perl hacker\n))); ' #  web
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