Uplink

Cheat mode:
Create a new agent with the name TooManySecrets (case-sensitive) and any desired password. Once the game begins, press [F1] to activate the cheat menu. Note: If you install the v1.2 patch, this code will no longer work.
Mastical Young and RockemSockem.

With the FBI mod installed, create a new agent with the name CharlieBean (case-sensitive) and any desired password. Once the game begins, press [F1] to activate the cheat menu.

Game secrets:
Mastical Young.

Introversion IP: "128.128.128.128"
Protovision game server password: "JOSHUA"
Gamebible password: "toomanysecrets?"
Uplink Test Machine password: "rosebud"

Game developers:
Get disavowed, then quit the game. Log back into the game and when the score screen appears, move the pointer to the upper-left corner. A symbol will appear. Click on the symbol.

Hidden message:
Open up the rear shell of the game's jewel case to find a hidden message on a white slip of paper.

Crack into the InterNIC:
To crack into the InterNIC, buy the Dictionary_Hacker v1.0 and use it on the Admin button.
Mr Meatloaf.

Mole Mission:
Hack the admin account of the Uplink Internal Service System. Once there, download the agent lists (you cannot get #4). You will soon be emailed about selling the list.

Hint: Cheaper memory:
When buying memory in large amounts, purchase it in 24 Gq bundles. It is cheaper than all the others per module.
Compgeek79.

Hint: False alarms:
If you have the motion detector turned on, it will turn red when technicians are installing parts. Do not nuke your gateway then.
Compgeek79.

Hint: Get extra links:
Go to interNIC. Go to "Browse/Search". The large bookmark menu is all of the links in the game. Press the "Plus" button to the left of the bookmark to get it. You can now use them to bounce around your calls.

Hint: Avoid getting caught by the sysadmin:
When you get to the main server on a LAN, the sysadmin will start tracing you as soon as you connect. The trace tracker starts going off and the LAN map starts showing the sysadmin's progress in tracing you. However, the two are not the same. On missions where you have to destroy the targets system's files, go into the console and type:

cd usr [press enter]
delete [press enter]

Then while it is deleting files type:
disconnect [press enter]

You can now switch to the LAN view and watch the admin, because the machine will not run the "disconnect" command until after it is done deleting. When the files finish deleting, you will be automatically disconnected, and since your watching the sysadmin you can hit the "Disconnect" button when he gets too close or the trace tracker runs low on time.
Compgeek79.

Hint: Saving your software:
Note: This is only really useful once you have got the Gateway Motion Sensor and Gateway Nuke. Get a "Copy and secure database" mission of any kind (corporate, research, software, customer, etc.) and your employer will give the address of the fileserver to upload all of the database files to. After you complete the mission and get paid, do not delete the fileserver link. Your password and username will work on that system indefinitely; after they pay you, go back to the server and upload all your software. Do not bother with Motion Sensor or Gateway Nuke, since you have to have hardware installed to use them. If the machine stops letting you copy files, you can delete the database files, as long as you have already been paid and keep uploading your software. Then, if you have to nuke your gateway you can connect again as soon as you get a new gateway. You do not need a Trace Tracker, and can get all your software back. You need to have the Connection Analysis, and LAN View upgrades before you can use LAN software or bypassers.
Compgeek79.