LenraVRe: Maybe--Question 5; No; 6; No; 5Tue Dec 8 23:41:52 1998 Hi Sandman,What i Noticed about this program is that everytime it adds the computed char to our string of valid serial no, it changes the location where it store the serial no. So, it seems like it generate a multiple copy of our serial. I was able to trace to this calculation routine and have found out that our 6th and the last char of our serial must comefrom this string "YMA19X@24$Z%". Location 00403AED to 00403B60 calculates 7thand up to second to that last char of our serial. Location 00403B76 and 00403BDA calculates the last char of our serial.Sure Hope i could post how it calculates our serial.but i guess its not yet time right. ;)Thanks Sandman for everything.Kind Regards,LenraV