That's an old-school C function declaration. Note that the function return type are parameter types are implicitly int. nE is then explicitly declared to be a char pointer pointer.
I think the reason for doing it this way rather than putting the type declaration alongside the parameter is then it would also demand also adding an int declaration for the BX parameter which would then cause the code to be longer. That is to say with:
main(BX,char**nE){
main(BX,nE)n**nE;{
main(int BX,n**nE){
If I got any of this wrong, I hope someone will correct me though :)