1. 1  any of several threadlike bodies, consisting of chromatin, that carry the genes in a linear order: the human species has 23 pairs, designated 1 to 22 in order of decreasing size and X and Y for the female and male sex chromosomes respectively.
data source name (DSN) A data source name (DSN) is a data structure that contains the information about a specific database that an Open Database Connectivity ( ODBC ) driver needs in order to connect to it.
What is DDNS. DDNS â Dynamic DNS. DDNS is a service that can be used to automatically update DNS records if client PCs get their IP settings from a DHCP Server.These updates are usually performed by the DHCP Server. DDNS is handy if you have a DNS Server in your local network that should be able to resolve the names of your local PCs.This information should not be forwarded to outside your network, unless you use public IP addresses.hese updates are usually performed by the DHCP Server. DDNS is handy if you have a DNS Server in your local network that should be able to resolve the names of your local PCs. This information should not be forwarded to outside your network, unless you use public IP addresses.