>what, in the vfp default form behaviour causes an application to lose something as vital as the main procedure file identified in the 'set procedure' call?
>
>If I call one form from another (as opposed to calling the same form from the main menu), then the routine procedures and functions called by many forms (and which are stored in the main procedure file) disappear.
>

THis shouldn't happen. Are you sure that your other forms aren't issuing another SET PROCEDURE without ADDITIVE?

SET PROCEDURE is NOT one of the commands that is scoped to a datasession.