APP_GLOBAL.DoNewOpen(.T.)是什么意思？

Question

* SEX_APP.PRG* This file is a generated, framework-enabling component
* created by APPBUILDER 
* (c) Microsoft Corporation
* Framework-generated application startup program
* for D:\DOCUMENTS AND SETTINGS\ADMINISTRATOR\MY DOCUMENTS\SEX\SEX Project#INCLUDE [..\SEX_APP.H]IF TYPE([APP_GLOBAL.Class]) = "C" AND ;
   UPPER(APP_GLOBAL.Class) == UPPER(APP_CLASSNAME)
   MESSAGEBOX(APP_ALREADY_RUNNING_LOC,48, ;
              APP_GLOBAL.cCaption )
   IF ARTYPEV(APP_GLOBAL.oFrame) = "O"
      APP_GLOBAL.oFrame.Show()
   ENDIF              
   RETURN
   
ENDIF   RELEASE APP_GLOBAL
PUBLIC  APP_GLOBALLOCAL lcLastSetTalk, llAppRan, lnSeconds, loSplash
LOCAL ARRAY laCheck[1]lcLastSetTalk=SET("TALK")
loSplash = .NULL.
SET TALK OFF#IFDEF APP_SPLASHCLASS   IF NOT EMPTY(APP_SPLASHCLASS)
      loSplash = NEWOBJECT(APP_SPLASHCLASS, APP_SPLASHCLASSLIB)
      IF VARTYPE(loSplash) = "O"   
         lnSeconds = SECONDS()
         loSplash.Show()
      ENDIF
   ENDIF                                #ENDIFAPP_GLOBAL = NEWOBJECT(APP_CLASSNAME, APP_CLASSLIB)IF VARTYPE(APP_GLOBAL) = "O" ;
      AND ACLASS(laCheck,APP_GLOBAL) > 0 AND ;
      ASCAN(laCheck,UPPER(APP_SUPERCLASS)) > 0   APP_GLOBAL.cReference =[APP_GLOBAL]
   APP_GLOBAL.cFormMediatorName = APP_MEDIATOR_NAME   #IFDEF APP_CD
      APP_CD
   #ENDIF
      
   #IFDEF APP_PATH
      APP_PATH
   #ENDIF   
   
   #IFDEF APP_INITIALIZE
       APP_INITIALIZE
   #ENDIF
   
   IF VARTYPE(loSplash) = "O"
   
      IF SECONDS() < lnSeconds + APP_SPLASHDELAY
         =INKEY(APP_SPLASHDELAY-(SECONDS()-lnSeconds),"MH")
      ENDIF      loSplash.Release()
      loSplash = .NULL.   ENDIF
   
   RELEASE laCheck, loSplash, lnSeconds
           
   IF NOT APP_GLOBAL.Show()      IF TYPE([APP_GLOBAL.Name]) = "C"
         MESSAGEBOX(APP_CANNOT_RUN_LOC,16, ;
                 APP_GLOBAL.cCaption )
         APP_GLOBAL.Release()
      ELSE
         MESSAGEBOX(APP_CANNOT_RUN_LOC,16)
      ENDIF   ELSE
      llAppRan = .T.
   ENDIF
   
     
   IF TYPE([APP_GLOBAL.lReadEvents]) = "L"
   
      IF APP_GLOBAL.lReadEvents
         * the Release() method was not used
         * but we've somehow gotten out of READ EVENTS...
         APP_GLOBAL.Release()
      ENDIF
   ELSE
      RELEASE APP_GLOBAL
   ENDIFELSE   MESSAGEBOX(APP_WRONG_SUPERCLASS_LOC,16)
   RELEASE APP_GLOBALENDIFIF lcLastSetTalk=="ON"
   SET TALK ON
ELSE
   SET TALK OFF
ENDIFIF TYPE([APP_GLOBAL]) = "O"
   * non-read events app
   RETURN APP_GLOBAL
ELSE
   RETURN llAppRan
ENDIF   
vf下的,是什么意思，能解释一下吗？