The original intended use for hlpidx was to store a string to be used as key to link to some information in a help database. Sadly, this has yet to implemented as originally envisioned (i.e. as something INFLD would respond to without the application being aware of it), but the possibility remains. And until then, many applications may find it useful to use the parameter as envisioned in order to implement their own help logic in a routine which serves as a wrapper to INFLD.
If HLPDIX contains a traditional help key in addition to a tool tip and/or mouse click string, then the help key string must be first, e.g.:
hlpidx="Traditional help key>Tool tip next" + chr(126) + Chr(7) + chr(250) + "213."
