A: Technically yes, but do not do this . Clients desync rapidly. Worse, the anti-cheat on GameRanger will flag you, resulting in a hardware ID ban.
To use a trainer with the Contra 007 mod, follow these steps: Preparation: Ensure you have Generals: Zero Hour patched to version before installing the mod. Mod Setup: general zero hour contra 007 trainer download
Here is the critical reality check: The devs designed Contra to be challenging and balanced for multiplayer. A: Technically yes, but do not do this