loopback for com port

Question

hello guys
  I am developing an application which communicates with a usb device attached to PC. Thuis device will be connected via a virtual com port (com14).
Actually i dont have this device attached physically to my system during development. Can i have any method to simlate this device or loopback a com port as we loopback ipaddress?
Please give me some suggession ASAP
Thanks in advance
Hari Krishnan
techiebuddy.com