According to Pismo:

I need to lock records or at least files on database written with GPC on Linux system ... how?

What do you mean by "locking records"? How would you do this manually or with another programming language? Peter Dipl.-Phys. Peter Gerwinski, Essen, Germany, free physicist and programmer peter.gerwinski@uni-essen.de - http://home.pages.de/~peter.gerwinski/ [971005] maintainer GNU Pascal [971001] - http://home.pages.de/~gnu-pascal/ [971005]