This action is called at the start of the template.
Window entry
It essentially serves to make the declarations of the resources required and the initialisations, for example:
to declare the global or local variables with the syntaxes of the type
Local Integer MA_VARIABLE
Global Char POUR_TOUS(100)
to assign the global variables
to open the tables with instructions of the type
If clalev ([F :XXX]) = 0 : Local File XXXXX : Endif
to display a message by assigning a text to the variable GMESSAGE and choosing the message type by GERR =1,2 or 3.
to interrupt the process by setting FIN = 1.