como "actualizar" una unidad de red

[marcoszorrilla]

Prueba con esta función del API.

The WNetAddConnection2 function makes a connection to a network resource. The function can redirect a local device to the network resource.

The WNetAddConnection2 function supersedes the WNetAddConnection function. If you pass a handle to a window that the provider of network resources can use as an owner window for dialog boxes, use the WNetAddConnection3 function.

DWORD WNetAddConnection2(

LPNETRESOURCE lpNetResource, // points to structure that specifies connection details
LPCTSTR lpPassword, // points to password string
LPCTSTR lpUsername, // points to user name string
DWORD dwFlags // set of bit flags that specify connection options
);

Un Saludo.