Thank you for your prompt answer. > Anything is possible, but it means reverse engineering more > of the Sequel/Gretag library for that instrument. > > I didn't see any point in doing so, without an instrument to > observe operations of, and check functionality against. > > A snoopypro trace of the instrument being opened, configured > and making readings would be a first step. > > There is a great deal of similarity between the different > model instruments, but the details vary. > > Graeme Gill. I have not used my calibrator since I reinstalled my XP 4 years ago, and now I cannot find the dongle to ProveIt. So I have no chance tracing the commands to the instrument. I have started to make project files to VC7.1 for the beta release, so far it goes smooth, except for one problem. The problem is with the numlib\LUTest: D:\Download\ArgyllCMS\numlib\bin>lutest ~~ check 0 = -374144419156711150000000000000000000000000000000000.000000, against 6.000000 LU test failed to verify I have not yet tried to debug it. Preben Soeberg