left-4-deadleft-4-dead-2
In Left 4 Dead, and also Left 4 Dead 2, does it make any difference which character you pick? Do they have different speed, toughness, accuracy, etc, or are they identical?
In single player, do they have different AI (weapon preferences, more likely to use or share healthpacks, etc)?
It is possible. If you use srcds to set up a dedicated server and note the LAN IP of the computer hosting it, you can enable the developer console in-game (under Keyboard settings then advanced) press the ~ key (on foreign keyboards, it is usually whichever key is next to the 1 key) to open it and enter the command connect <LAN IP of server> into it. You'll then be dropped into the game. Make sure to edit the key of the server so that random people don't start joining. Consider setting it to LAN-only.
If you're using a non-QWERTY keyboard, sometimes binding the developer console may not work. If so, you can edit the launch options and add --console. Then, whenever you launch the game, you'll have console open.
I could post an elaborate answer which would be basically ripping off other people's work, but instead I'll just show you a link to a great tutorial. Adding a radial menu.
If you need to know what commands to use et cetera just let me know what you want to do and I (or someone else here) will help you further.
Best Answer
The only difference is in the bot AIs. This Question goes into depth on the specifics of that.