We present an overview of the variety of databases and programs that o
ffer substantial aid to medical and molecular geneticists. Databases a
nd expert systems for genetic diseases and birth defects, programs for
segregation and linkage analysis, certain DNA and protein sequence da
tabases, and information resources in general for molecular biology ar
e addressed. These systems cannot be used effectively without the newl
y developed techniques of information exchange based on international
computer networks. A short introduction is given to the Internet and t
o European institutions and organizations that offer help with the aqu
isition and use of bioinformatic resources.