is onload event a must with jquery?

is onload event a must with jquery?

Hello,

I am supporting a product which involves a embedded remote javascript  call

in our clients web sites.(the js script is placed at the end of the page before the closing body tag) 

Now, this call brings a special javascript functionality to the web page and has a massive

dom interaction, like  inserting HTML to specific dom nodes, attaching new events and more.

This interaction is not restricted to a onload page event and for this reason I ask

If jquery can help me with dom interaction as by default it waits for a onload event to start any

Command activity.
Thanks,
Yoni.