como detecto conexion?

[sdnsdlm]

De Microsoft:

'Function Name: InternetGetConnectedState
'Goal: Retrieves the connected state of the local system.
'Returns: Returns TRUE if there is an Internet connection, FALSE otherwise.
'Arguments
'lpdwFlags: Address of a double-word variable where the connection
' description should be returned. Can be a combination of
' the following values:
' INTERNET_CONNECTION_MODEM Local system uses a modem
' to connect to the Internet.
' INTERNET_CONNECTION_LAN Local system uses a local
' area network to connect to
' the Internet.
' INTERNET_CONNECTION_PROXY Local system uses a proxy
' server to connect to the Internet.
' INTERNET_CONNECTION_MODEM_BUSY Local system's modem is busy
' with a non-Internet connection.

'dwReserved: Reserved. Must be set to zero.

Así que:

Public Declare Function _
InternetGetConnectedState Lib "wininet.dll" (lpdwFlags As Long, _
ByVal dwReserved As Long) As Long