...had for pc? I had this game no later than 2004.
As stated it was similar in design and gameplay mechanics to the command and conquer series.
I seem to remember some buildings being able to convert to vehicles and move to a new base location.
I have no idea weather it was an online playable game or not but i did not use it online.

I believe that there were other usable characters besides "mechs"
And for some reason I think i had a beta version or beta was in the name.