Term	Definition
Alias	a short, user-defined name representing an ADDE dataset name; for example, the alias GV1 might represent the dataset name SSEC-RT/GOES8-1KVIS
Client	workstation receiving and displaying data
Dataset	collection of one or more files with a common format; for example, one dataset may consist of areas 101 to 104, another dataset may consist of MD files 1 to 10, another my consist of GOES-East visible images collected during a field campaign, etc.
Dataset Name	name used by ADDE to reference a dataset; the dataset name consists of a group name and a descriptor name separated by a slash ( / ); for example, GINIWEST/GW1KVIS
Descriptor	name used to reference a dataset; for example, a dataset of GINI West images containing visible data at 1 km resolution might have the descriptor GW1KVIS (GINI West 1 km VISible)
File Number	number used to reference a McIDAS format file (the standard McIDAS numbering scheme)
Format	file format; McIDAS formats include AREA, GRID and MD; non-McIDAS formats include NEXRAD, WSI NOWRAD (tm), HDF and netCDF
Group	name used to reference a collection of descriptors; used by the client to determine which server should receive data requests
Position	absolute or time-relative position of a file in a dataset; position numbers greater than zero represent an absolute position in the dataset; position numbers less than or equal to zero represent a relative position, 0 is the most recent and -1 is the next most recent; for example, if a dataset has four images with times 13 UTC, 14 UTC, 15 UTC and 12 UTC, they have the positions -2, -1, 0 and -3
Server	machine storing and supplying data
Type	data type: image, grid, point, navigation, or text