How do you open a file in a Homegroup?

Hi this is my first post here, I am making a "chat room" program for people in your homegroup, but i cant seem to figure out how to open a file from your homegroup, i know whats wrong but i cant fix it

	 if(progressBar1->Value==0)
				 {
				 richTextBox1->Text=richTextBox1->Text + "\r" + "<@" + nick->Text + "> " + richTextBox2->Text;
				 richTextBox2->Text="";
				 richTextBox1->SaveFile("C:\\Users\\monkeyboystein\\Documents\\Server\\log.rtf");
				 }

thats how I'm saving it,
but i cant figure out how to open it from another computer,