I believe this is difficult, if not impossible. The problem, as you've probably found, is that all the C functions you need (GetTabTextFromArea etc.) only support 255 characters.
This is not the issue of upgrade SERP. But serverip.dat in this case contains the value: 192.168.88.12:1301, so this is local IP of the server with SERP.
Anyway I don't understand what do you me...
