AL (automatic lights) can be made with or without light sensor.
With sensor it's working like this: You start the engine, the low beam goes ON, when you enter in a tunel or in the evening the positions goes ON too. Now you have positions and low beam ON, the light lever is OFF. So, if you put on "manual", the lights lever on positions, the low beam goes OFF...and then you are on "manual" lights...until next time.
Without sensor, the module is working a litlle bit simplier: you start the engine, the low beam goes ON, until you put the positions from lever and the module goes OFF. This is a alternative sollution to DRL, if you have low beam halogen lights, and you want to use it durring the daylight without positions lights ON.
So, in conclusion:
DRL, for High beam, protects low beam (xenon especially), no dash lights and rear lights ON durring the day.
AL, for Low beam, no dash lights and rear lights ON durring the day, with or without light sensor.
FMH, for fog projectors or low beam, with light sensor (so, it will function only in the night), very useful in poorly illuminated areas.
HWM, helps you to replicate the oem factory sollution, if you have xenon and it's installed afterwards...it's good to have functional washers too.
First picture: drl on clio 2, second picture: drl on clio 3, third picture: AL module with light sensor (this is how the module looks).