The following parameters can be passed on the query string when starting Genie sessions:
skin: Pass desired skin name (case insensitive) to launch with. If not passed, default skin set in Administrator will be used.
log: Pass '1' to enable 5250 session logging, see here.
trace: Pass the starting step number to begin a trace based on a 5250 session log.
token: Used for automated sign on with custom exit program, see here.
workstnid: Pass desired workstation device name -- supported only with Virtual Terminal connection.
suffixid: Pass '1' for automatically appending suffix to work station device name to avoid duplicates when using above parameter. Similar to "avoid duplicate names with other workstations" in Client Access.
macro, var, val: Used for running macros, see here.
plog: Pass '1' to enable Profound.js performance logging, when calling Profound.js modules from Genie. See here.