LAYER

It manages the layers and their properties

PROPERTY

It controls the properties of existing objects

AI_SELLAST

It selects the last inserted or modified objects

AI_SELINV

It reverses the current selection

AI_SELALL

It selects all the objects

AI_SELALL_AL

It selects all the objects on the current layer

AI_SELNONE

It deselects all the objects

CPOLYGON

It selects all the objects intersecting a polygonal area  

WPOLYGON

It selects all the objects inside a polygonal area