>I have a form with a procedure that needs to be called from multiple places within the same form. If I place the procedure in a procedure file I can no longer make "thisform" type refrences. Where can I store this procedure so that it is considered part of the form?
>

Create a new method of the form and invoke it rather than a procedure; IOW, if you now reference your procedure by:

DO MyProc

You could create a method of the form called MyMethod, and invoke it as:

thisform.MyMethod

Methods operate like functions in that they can return a value if you need them to, and like both procedures and functions can accept parameters. If you now invoke your procedure by

DO MyProc WITH "one potato", Date()-42, SomRandomCVariableRef

your method would be invoked by:

thisform.MyMethod("one potato", Date()-42, SomRandomCVariableRef)

A method behaves more like a function call, in that values passed to a method are passed by value rather than by reference. If you pass a variable into a method call and must have the value altered in the method, you must prefix the it with the @ qualifier to tell VFP to pass by reference. If you pass a variable to your procedure, which changes it, and you want that value changed, invoking it via DO now would look like:

Do MyProc WITH SomeVariableToChange

Invoking MyProc as a function would require the @ prefix, like a method call would:

=MyProc(@SomeVariableToChange)

You'd use the same technique to pass by reference to your method:

thisform.MyMethod(@SomeVariableToChange)

If instead, you invoke the method without the @ prefix, the variable will be passed by value, so that any changes to the value will not affect the original copy:

thisform.MyMethod(SomeVariableToChange)

>Marvin