How to Determine the Active & Previously Active Forms

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1. Create three forms (Form1, Form2, and Form3).
2. Open the debug window and type the following:

      _SCREEN.FORMS(1).NAME
      _SCREEN.FORMS(2).NAME
      _SCREEN.FORMS(3).NAME
      _SCREEN.ACTIVEFORM.NAME
      _SCREEN.FORMCOUNT

3. Inside the Command window, type the following:

      DO FORM FORM1
      DO FORM FORM2
      DO FORM FORM3
   						

   Note the following from the debug window:

      _SCREEN.FORMS(1).NAME         FORM1
      _SCREEN.FORMS(2).NAME         FORM2
      _SCREEN.FORMS(3).NAME         FORM3
      _SCREEN.ACTIVEFORM.NAME       FORM3
      _SCREEN.FORMCOUNT             3
   
      Note that _SCREEN.FORMS(3)= _SCREEN.ACTIVEFORM

4. Select Form1, and note the following changes from the debug window:

      _SCREEN.FORMS(1).NAME         FORM2
      _SCREEN.FORMS(2).NAME         FORM3
      _SCREEN.FORMS(3).NAME         FORM1
      _SCREEN.ACTIVEFORM.NAME       FORM1
      _SCREEN.FORMCOUNT             3

Notes

_SCREEN.FORMS(_SCREEN.FORMCOUNT) always references the active form object.

_SCREEN.FORMS(_SCREEN.FORMCOUNT).NAME references the name of the active form.

_SCREEN.FORMS(_SCREEN.FORMCOUNT).CAPTION references the caption of the active form.

_SCREEN.FORMS(_SCREEN.FORMCOUNT -1) always references the previously active form object.

_SCREEN.FORMS(_SCREEN.FORMCOUNT-1).NAME references the name of the previously active form.

_SCREEN.FORMS(_SCREEN.FORMCOUNT -1).CAPTION references the caption of the previously active form.