. Tidbits of information referenced by other help pages. Entering Sexagesimal Positions : hints on entering positions in :':"." fields. Entering Sexagesimal Offsets and Durations : hints on entering offsets and offsets in :':"."/h:m:s fields. Special Files : a list of the special files read and written by TUI, with links to more information. TUI Keywords : keywords used by TUI for error messages and such.