...
GN_Flo, open a filter
GN_Flc, close filter
GN_Flf, flush filter
GN_Flr, read from filter
GN_Flw, write character to filter
GN_Fpb, push back into filter
Handles
OS_Fn, handle functions (OZ usage)
OS_Gth, get tri-handle (OZ usage)
OS_Vth, verify tri-handle (OZ usage)
OS_Fth, free tri-handle (OZ usage)
Input
GN_Sip, system input line routine
OS_In, wait for character from standard input
OS_Pur, purge keyboard buffer
OS_Tin, read character from standard input, with timeout
OS_Xin, examine input
...
GN_Opw, open wildcard handler
GN_Wcl, close wildcard handle
GN_Wfn, fetch next match for wildcard string (handle)
GN_Wsm, match filename segment to wildcard string
Handles
OS_Gth, get tri-handle (OZ usage)
OS_Vth, verify tri-handle (OZ usage)
OS_Fth, free tri-handle (OZ usage)