[ubuntu] Can VNC server Run both before 'and' After login

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http://ubuntuforums.org – I have my desktop Precise system at home always logged in (gnome) and Thunderbird is running so it can forward certain emails to my cell phone when they arrive (among other things). Sometimes I want to be able to remotely control the desktop session currently running and other times I want to remotely login to my desktop system using a different user id. I've tried running vnc on multiple displays (:1 :2 etc) but the additional logins under the same user ID caused problems with some of the running programs in the main or primary 'display'. Is it possible to be able to have two vnc servers r (Hardware)