how are external ? subdirectories pulled in by CVS ?

[Rod Butcher <rbutcher hyenainternet com>]

I get a subdirectory libgswitchit when I checkout gnome-applets, yet I 
can't see libgswitchit in http://cvs.gnome.org/viewcvs/gnome-applets .
Can somebody please educate me on what to look for here to see what 
happens, or point me to somewhere where such wizardry is described ?
CVS just shows :-
cvs server: Updating libgswitchit
with no explanation of anything unusual happening
thanks
Rod Butcher
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