You need to go into the admin menu, access logs is inside that.
Not all computers have logs that you can access, but they still keep them so you'll have to break your trail on a different one.
The most important one you'll want to use, and then delete the logs from is internic, it should be your first bounce, and you should have a habbit to delete the logs off there every time you hack.
For internic, connect to the server, there are two buttons, the bottom one is admin, click that. It asks for a password (that nice for you never changes), so get past there by putting in the pw or cracking it, and then you'll be at admin. The first button is to access the logs. Click that, you'll be looking at the logs and then just delete whatever might be incriminating you, starting at the top (as deleting logs far down takes much longer since it moves everything above down.
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Cheat in almost any mac game. Even Nova... Even UPLINK.