Use it as:

fprintf( stout, "Hello %s
", name );
this line prints Hello on the console.

to print "Hello" in a file, put the file pointer in the place of stdout
eg:
fprintf( fp, "Hello %s
", name );

however, the file should be opened in write mode since we are writing.

no u can't do it...it is used to write data into the file...

Yes. by duplicating the ostream file descriptor

#include<stdio.h>
int main()
{
char name[10]="prachee";
fprintf( stdout, "Hello %s ", name );

getchar();
return 0;
}

fprintf(fp,"%d",printf("Hello"));

THis prints Hello on screen

Yes every thing is possible in C
#define fprintf printf
main()
{
fprintf(" hello");
}

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