Here is a list of all related documentation pages:

GipsyX DataTypes
GEOP File Format
meta file format
Piecewise Constant Model Parameter Format
quaternions format
JPL GNSS Products File Naming And Directory Structure
Time Dependent Parameters (tdp files)
pos_goa format
gdcov format
Real-time JPL available streams
Shadow History file format
WLPB list file format
xfile format