Determining a form's state

There are occasions when you will want to know, for example, if a given form is open. This can be quite easily done using SysCmd, a technique I quite often use to automatically close form A when closing B. In the example that follows SysCmd is used to check whether the frmSale form is open and, if so, closes it.

Private Sub Form_Close()
    'There are four states you can check for:
    'acObjStateOpen - open
    'acObjStateNew - new
    'acObjStateDirty - changed but not saved
    '0 (zero) - closed or non-existent
    If SysCmd(acSysCmdGetObjectState, acForm, "frmSale") = acObjStateOpen Then DoCmd.Close acForm, "frmSale"
End Sub