cl OpenBSD.cpp /GS?

Is this the same as the /GS option in VC++ and with from what I understand Windows 2003 Server?  The only real reading I've done on this is Sam's article, and from what I understand is that they are doing the same StackGuard type prevention.  Am I right?

I don't know why I'm so obsessed with buffer overflows, I guess I'm just kinda sick of seeing patches related to them and having to restart my machine while reading my e-mail.