For communicating with the modem and passing raw data over the connection under Win32/Perl you should use Win32::SerialPort. However, this won't help you with PPP (well, if this were another OS you could use the SerialPort module to dial the modem and then start up the PPP process to negotiate and test the ppp connection). The only PPP driver I know of for Win32 is the one that is part of Dialup Networking In the Win 3.x days there used to be lots of 3rd party dialers/IP stacks (trumpet winsock, etc...) however I don't know if any of those are still around. So you may have to figure out how to get perl to work with Dialup Networking.