VNC install--possible dependency error?

[Carl Fink <carl@finknetwork.com>]

Here's a transcript:

NewPicking:/home/carlf# apt-get install vnc4server xvnc4viewer vnc-java xtightvncviewer 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following extra packages will be installed:
  vnc4-common
Suggested packages:
  vncserver tightvncserver

I'm installing vnc4server explicitly.  Why is Debian recommending that I
install two other VNC servers as well?
-- 
Carl Fink                                   nitpicking@nitpicking.com 

Read my blog at nitpickingblog.blogspot.com.  Reviews!  Observations!
Stupid mistakes you can correct!