>I´m working on a project with a team mate and we share the same class library; when one of us tries to run a form, gets the message "Alias already in use" from the line "set classlib to mylib". What could we do to avoid this?
>
>TIA.

you should wrap with command in a if/endif, e.g.

if not "MYLIB" $ upper(set('classlib'))
   set classlib to mylib additive
endif