about "set" variables

[Sharon Gifford]

Most Swarm examples that I have studied have something like the following in 
Heatbugs:

- setIdealTemperature: (HeatValue)i;
- setOutputHeat: (HeatValue)o;


- setIdealTemperature: (HeatValue)i
{
  idealTemperature = i;
  return self;
}

- setOutputHeat: (HeatValue)o
{
  outputHeat = o;
  return self;
}

I have searched the files of Heatbugs to find the role played by "i" and "o" 
but cannot see one.  When "idealTemperature " and "outputHeat" are referred to 
later, there is no reference to "i" and "o".  How do the values of "i" and "o" 
get determined?  What do they do?



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