Registration
On commercial copies of Galactic Empire, a registration number was provided to you once you purchased it. This value had to be entered under the REGNO field of MBMGEMSG.MSG in order for the game to function properly.
When the source code to Galactic Empire was made freely available, the REGNO required was changed to be the same as the MajorBBS registration number. If you are using a copy compiled from source or downloaded from the MBBSEmu site, simply set REGNO to the same number as your MajorBBS registration number (or the value of GSBL.BTURNO in appsettings.json in an MBBSEmu installation).
On commercial copies of Galactic Empire, the required value is as follows: take the XOR value of your MajorBBS registration number and 10094056, then for each digit of the resulting number, add each digit of 10094056 modulo 10[1]. For example, if your MajorBBS registration number is 52947184, the XOR value of 52947184 and 10094056 is 62778648; you would then add each digit of 62778648 and 10094056 (6+1=7, 2+0=2, 7+0=7, 7+9=1[6], 8+4=1[2], 6+0=6, 4+5=9, 8+6=1[4]). The resulting registration number would be 72762694.