history data

Hi all

We have a situation where the 'data history function' works perfect and one client whose history does not always work as it should.
So we decided to implement our own history files.

I am sure someone already did this.

Would whoever did this, please give us some hints as to were to hook our code so it has the least impact on the software and any other hints that you deem you can share.

Thank you very much
Noel