Right click on the Netscape Desktop icon, or the Quick Launch icon
Select: Properties
Click on the Shortcut tab
To the existing Target line, add the following:
-p profilename
The Target line should now be similar to this:
"C:\Program Files\Netscape\Netscape\Netscp.exe" -p profilename
NOTE: There is a space after Netscp.exe" and before -p