HFIX instructions suitable for SHELXL are generated and included in a modified .res file.
The modified .res file in written out with the .new extension.
The HFIX feature can be invoked from the PLATON main-menu by clicking on the 'HFIX RES' button.
HFIX-RES can be invoked also from one of the PLUTON menu's. However, this will work only when PLUTON is called DIRECTLY as 'platon -p' (or via 'To Platon') and not indirectly through PLATON (since in this mode PLUTON is run on an internally generated non-res file).
The actual H-atom coordinates can be generated subsequently using the (renamed to .ins) '.new' file as input to SHELXL.
Various 'HFIX' entry modes are available.
Atoms to HFIX can be clicked on or a loop can be started over all relevant atoms. The atom that is currently under consideration is displayed with a RED label along with the suggested HFIX code (see SHELXL manual) in square brackets.  indicates NO HFIX.
Suggested values can be adopted by hitting RETURN or overruled by entering the desired value. A negative value should be entered to avoid addition of H-atoms. 'Auto' will introduce H-atoms with the suggested HFIX types without further questions asked.