So you have a Tech2 scan tool but a lot of the things you would like to do is locked out because you don't have access to the computer software to allow you to do it. Things like updating PCM's and modules and anything security related are locked out. If you bought one of the Tech2 clones, it probably came with a CD with the Tis2000 software. If you install it and try to use it, it says that it can't find the USB security dongle or something like that. That's because only dealers have those or a clone of one wasn't included.
Warning: In Tis2000, whatever you do, DO NOT USE THE "SOFTWARE DOWNLOAD" BUTTON! This will retrograde the card in your Tech2 to an old version from 2008.