Where is guidgen.exe?

Hello.

In the OCAF Sample this lines are used to add function drivers to the table:

Handle(TSampleOcafFunction_BoxDriver) myBoxDriver = new TSampleOcafFunction_BoxDriver();

TFunction_DriverTable::Get()->AddDriver(Standard_GUID("BoxDriver"), myBoxDriver);

Is this the correct way? I think this doesn't create unique GUIDs. I added some function drivers this way but sometimes the wrong fdriver is called.

I saw a post that mensioned guidgen.exe. Is this the way to create "unique" GUID from a specific word? Where is this file?

Thanks