Seeking cover
This page covers the rules for 'seeking cover', a part of the movement rules. The rules for close combat are here, those for ranged combat here. An overview of the combat rules is here.
A character can move into cover behind an appropriately high possibility (at least hip high), for example behind a rock, but also with his back to the wall. This action costs two AP.
The character can fire without leaving his cover, by just holding the weapon out of the cover and firing unaimed in the rough direction of his enemy, but this is only permissible in the ranges CQC and close range.
In CQC he receives a handicap of 20 points, in close range of 35 points.
If the character leaves his cover for a moment to shoot, the shot costs one AP more and the character does not receive a handicap.
Fully leaving the cover costs another AP.
A covered character isn't completely protected: The attacker does have a handicap of 40 points on every covered character, exempting characters that react.