If you need to map a network drive (on a windows OS) via LotusScript you can create a WScript.Network object and use the MapNetworkDrive function:
Set x = CreateObject("WScript.Network")
x.MapNetworkDrive strLocalName, strRemoteName, [bUpdateProfile], [strUser], [strPassword]
Example:
Set x = CreateObject("WScript.Network")
x.MapNetworkDrive "x:","\\8.8.8.8\acmeshare", False, "acme\user001","myPassWord"