F1 in selection screen field

http://www.saptechnical.com/Tutorials/ABAP/F1Help/Create.htm

Author: nununo

f1_in_selection_screen_field.abap

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+REPORT zzz_abapinho_f1_selscreen.
+
+PARAMETERS: p_name1(10) TYPE c.
+PARAMETERS: p_name2(10) TYPE c.
+
+AT SELECTION-SCREEN ON HELP-REQUEST FOR p_name1.
+
+  CALL FUNCTION 'DSYS_SHOW_FOR_F1HELP'
+    EXPORTING
+      dokclass         = 'TX'
+      doklangu         = sy-langu
+      dokname          = 'ZZZ_ABAPINHO_UNAME'
+      doktitle         = 'Título da coisa'
+    EXCEPTIONS
+      class_unknown    = 1
+      object_not_found = 2
+      OTHERS           = 3.
+
+AT SELECTION-SCREEN ON HELP-REQUEST FOR p_name2.
+
+  MESSAGE i052(00).