Pass a value through a URL

We are providing some of our executives with an icon (URL Shortcut) on their desktop which will open the CRM directly into a task form that we’ve created for them. The URL should pass over 2 hardcoded values which will pre-populate 2 fields in the form. One variable should pass the executive's assistant name to the “Assigned To” field so each time the executive creates a task it will be assigned to their assistant. All executives and assistants have CRM licenses.

Here is the URL we are using:
https://secure-ausomxPOD.crmondemand.com/OnDemand/user/TaskNew?OCTYPE=EZ%20CRM%20Form&TaskEditForm.Type=EZ%20CRM%20Form&TaskEditForm.Assigned%20To=Kelly%20Kay