It is possible to arrange for an object to generate and emit "particles" under script control. For example, an object can be set up to emit bubbles, sparks, fire, etc. 

LSL provides a set of functions for linking and managing sets of primitive objects, sometimes called "link_sets." Primitive objects that are linked together will behave like a single ...

Here is a very simple program that changes the color and size of the object every time the object is touched. It demonstrates how to enter and run a  simple script

This tutorial is intended for those who have never programmed before, Second Life or elsewhere. However, this tutorial will make little sense outside of Second Life. LSL is very specific to Second Life.
You will ...