VMS Help — PEEK Watching Init and Finish Sequences, Keywords GL
The GL and GR keywords take one of the following keyword values:
G0, G1, G2, G3. E.g. CHARACTER_SET=(GL=G0,GR=G2).
GL=G0 outputs "<SI>".
GL=G1 outputs "<SO>".
GL=G2 outputs "<ESC>n".
GL=G3 outputs "<ESC>o".