Writing plugins - How to questions..

Can I ask what the plugin relys on True Launch Bar for?

Graphics
Does TLB simply allocate a square of bar for the plugin icon to
appear in?.. or is it a complex interaction, where TLB does the
actual display of various component icons on behalf of the plugin?

I assume plugin configuration dialogues are entirely
independant of TLB?

User Input
Does TLB pass mouse click data to the plugin (say for the
Winamp plugin, where there are various buttons?) Or is the
plugin detecting and acting on these by itself?

Thanks /Mark