1 FD$ (Field attributes)
 1 Sintax:	FD$='_SCRF1$,_SCRF2$,_SCRF3$...'
 1 Sample:	FD$='_CUSTOMER$,_ADDRESS$,_TELEPHONE$,_SALES#'
 1 Notes:	Specify the screen field identificator. It must begin with _, and the last char
 1		must be $ for character fields, # for numeric field,and none for integers.
 1		If not specify, the default identificators will be _SCRFn with the appropiated
 1		last char.
 2 ALARM$ (Field attributes)
 2 Sintax:	ALARM$="EXP1,EXP2,EXP3"
 2 Sample:	ALARM$="_SCRF1$>'',,,_SCRF4>1&&_SCRF4<3"
 2 Notes:	Specify the conditions for a field to be accepted. Null represent no condition.
 3 ASSIGN$ (Field attributes)
 3 Sintax:	ASSIGN$="EXP1,EXP2,EXP3"
 3 Sample:	ASSIGN$=",,FN$TRIM(_SCRF1$)+' '+_SCRF2$"
 3 Notes:	Specify the default data assigned to any field wich needed it.
 4 LNASSIGN$ (Field attributes)
 4 Notes:	Undocumented by now.
 5 FILEDEF$ (Field attributes)
 5 Notes:	Undocumented by now.
 6 PERFORM$ (Field attributes)
 6 Notes:	Undocumented by now.
 7 UPDFIELDS$ (Field attributes)
 7 Notes:	Undocumented by now.
 8 WIDTHS$ (Field attributes)
 8 Sintax:	WIDTHS$="w1,w2,w3..."
 8 Sample:	WIDTHS$=",,,20,20,20"
 8 Notes:	Specify the visible area in the screen for each field. By default, the width of the
 8              field is assigned as a parameter, but this allow view only a portion of the data.
 9 TYPES$ (Field attributes)
 9 Notes:	Undocumented by now.
10 FLDHELP$ (Field attributes)
10 Sintax:	FLDHELP$="filename,screenNum"
10 Sample:	FLDHELP$="help.txt,2"
10 Notes:	When a field may need aditional information for the user (help), you can specify
10		here the file wich has the information and the index in the file. Help files has
10		a numerical index of two char width and the text of help.