Logon to load balancing group

Hi,
I have configured logon  groups. I could connect to this group from PC where i have perrmisions to edit c:\windows\system32\drivers\etc\services file. In this file i inserted sapmsPRD  3606/tcp. That's works. But problem is in other PC, there no perrmisions to edit this file, and i couldn't connect to configured logon group. So, how i could solve this problem with no perrmisions to edit service file ?

One possibility we use is a direct call of sapgui in an icon like this:
C:\Program Files\SAPgui\SAPgui.exe /M/server/S/3600/G/SPACE
This works without any additional entries in etc/services.
HTH, Rudi

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