Urgent (MS Comm )

Hi All,
Iam Prasanna,Iam new to this forum and also new to VB. Please kindly help me by sending any sample code for MS Comm Control.
The requirement is as follows.
First when I send some signals to the Handterminal it will again send in the signal saying want some data..then based on that i have to send the information as per the request and again wait for the signal from terminal whether it got saved or need any further information.
once the Done signal arives I have to clear the mscomm and release the port.
I need to check the timer as well in this process. :(
And even I will be uploading some data from the terminal as well as per the signals I send and recieve from the terminal.This I can say that handshaking.
I hope that Iam clear. :ehh:
send code if any one worked on the same issue.
Thanks in advance
Prasanna