That can be handled in a variety of ways.

Some update the related from only when the related form is activated. But, in this scenario, the data available to the user isn't all in sync.

For that, the main form must have access to an object reference for the related form. If it's a parent/child situation -- the main form is called from the related form -- you can do the following:

Pass an object reference as a parameter to the main form.

DO MainForm WITH THISFORM

In the INIT of the main form, store the object reference to a property of the form.

PARAMETERS    toCallingForm
THIS.oCallingForm = toCallingForm

Then, in whatever method/event you want:

THIS.oCallingForm.Refresh()

If you want to update another form that hasn't been called in that nested fashion, you'll need to log that form in property of your application object, or a global variable.

In your main program:

PUBLIC   oUpdateMe
oUpdateMe = .NULL.

In the INIT of the related form:

oUpdateMe = THISFORM

In the desired method of the main form:

IF NOT ISNULL (oUpdateMe)
    oUpdateMe.Refresh()
ENDIF

HTH,

Jay