How to call the Profile Field Variables

[abroad]

How can I call the Profile Field Variables of a Member? (and also check if this field is empty or not)

Is the variable something like userid[field3]?

[NolFito]

As far as I knwo you can't in blogs except in the sidebar :S (anoying)
http://www.vbulletin.com/forum/showthread.php?t=243356
My blog looks rather lame, as I have no means of using remote avatars, gender, and other things I do (one can do) with the field variables :(
Been reading over all the code, but I'm just useless at it :(

to check if any field is empty xxxx substituted for bbuserinfo, post, show etc... depending on where you are
<if conditional="$xxxx[field3]">if not empty <else />if empty</if>