Help! Documents for beginner.

Hello everyone,

I am a beginner with allegro skill.
I'm trying to read a piece of skill program as follows:
================
WIDTH_ScriptText = strcat(
"setwindow pcb ;"
"setwindow form.mini ;"
"FORM mini line_width " WIDTH_Number " ;"
"setwindow pcb ;"
)
================
WIDTH_Select = car(axlGetSelSet())
WIDTH_PadSelect = WIDTH_Select->pads
================
I having some issues:
+I can not find any information about the command" setwindow" in the document "Allegro User Guide: SKILL Reference"
and "SKILL Language User Guide"
+properties of the object in the allegro.(example:WIDTH_PadSelect = WIDTH_Select->pads)

Can you show the documents containing this information?Please!

Thanks and best regards,

Ken Le