1st step:
---------

Find the earth800.bat OR earth640.bat in the earth
directory. It should look like this for the earth640.bat:

if not exist vxdldr.exe goto DOS
start /m vxdldr.exe
:DOS
eregcard.exe
dos4gw game.exe x640

Now add the following commands to the file (MS WW)
to make it look like this:

if not exist vxdldr.exe goto DOS
start /m vxdldr.exe
:DOS
eregcard.exe
dos4gw game.exe x640 MS WW

Do the same with the earth800.bat and the
first step is complete.

2nd step:
---------
During the game, hold down the SHIFT key
and type the following commands:

rthcshe = gives you 5000 cash every time you type it in
rthshowmp = self-explanatory... shows the whole map

Water Battle Defense:
---------------------
In case the water troops get too powerful,you should
build some WTP 100 air-cushion transporters and place
some SPIDER or SPIDER 2 units on them.