I am using VS SP3 and NT SP3. I don't know how to check whether the port is seized by others or not. All TAPI applications including Hyperterminal works.

>Once again, I would make sure you have Service Pack 3 of Visual Studio installed. And, I would verify that the port you are referencing is not in use by something else.
>
>>First, I must apologize to VFP forum members for posting codes in VB. I am very much a VFP programmer but I have problem getting MSCOMM32 done in VFP.
>>
>>2 questions:
>>1. How to get MSCOMM32 to work on VFP. I see a lot of OLE errors on the object property sheet.
>>2. With reference to the following codes, I get error = Port already open and Portopen and subsequent system just waits on doevents. Any hint?
>>
>>Private Sub Form_Load()
>> CommCtrl.CommPort = 2
>> CommCtrl.Settings = "9600,n,8,1"
>> CommCtrl.InputLen = 0
>>On Error Resume Next
>>If CommCtrl.PortOpen = False Then CommCtrl.PortOpen = True
>>If Err Then
>> MsgBox "There was an error opening the port. Error = " & Error$
>>End If
>>If CommCtrl.PortOpen = False Then
>> MsgBox "PortOpen"
>>End If
>> CommCtrl.Output = "ATZ" + Chr(13)
>> Do
>> DoEvents
>> InString$ = InString$ & CommCtrl.Input
>> If InStr(InString$, "OK" & vbCrLf) Then Exit Do
>> Loop
>> Debug.Print InString$
>> If CommCtrl.PortOpen = False Then
>> CommCtrl.PortOpen = True
>> End If
>>End Sub
>>
>>
>>>Are you sure you can open the port? Are you sure you have the correct port setting? I can use the control in both VFP and VB.
>>>
>>>
>>>>>I have NT 4 SP3 and the MS COMM control works fine for me....
>>>>>
>>>>>>>>I meant CrystalComm. Can the MSCOMM control use KERMIT? I was told not.
>>>>>>>>Marcus.
>>>>>>>
>>>>>>>I don't know if MSCOMM supports kermit. For something more sophisticated, I would check out www.mabry.com.
>>>>>>
>>>>>>Does MSCOMM works on WinNT 4.0 SP3? I didn't manage to get it working the last time I tried. Did you have any success?
>>>>
>>>>
>>>>Do you have any idea why I can't open the port even when Port_open = False? I am using VB. Are you using VFP to call MSCOMM32?
>>>>
>>>>I test using:
>>>>If mscomm1.port_open = false then
>>>> mscomm1.port_open = true
>>>>endif