Editing ExtraData (section)

====recordnum====
The recordnum serves to identify this record, and is the number which ExtraData sector control linedefs must use to associate themselves with a sector record. Every ExtraData sector record must have a unique record number. If a duplicate record number is detected, the engine will currently exit with an error message. The record number is limited to values between 0 and 32767 inclusive. Some editors may only allow input of numbers up to 255 in the linedef tag field. Beware of this.