Single Page Subfile Example

Hi Group,

Please let me know if there are any sample codes for wrtitng a typical
maintainance single page subfile example in RPG IV.I understand that to keep
the options , that user has selected on the screen, arrays have to be used
for storing.So that when Page down  has been pressed, and again page up is
done i donot lose the options that the users have entered .Any example on
how this 
has to be done?

I have been maintaining some old codes of Load all and Expanding
maintainance sub files.But they are not very structured in the sense that
they use a lot of Go to statements to handle various events after different
screens are presented..Is it possible to have a single EXFMT in the code and
also a single set of subroutines for handling 'keys pressed' events instead
of multiple EXFMTs and same set of 'keys pressed ' subroutine copied again &
again?

Please point me toward good structured RPGIV code samples


Thanks and regards
Chandra Sekhar Rath