Spell checking requires the following modules be in the BIN directory:

SPELL32.DLL

DICT25.APP  (application dictionary)

DICT25.D    (main dictionary data)

DICT25.I    (main dictionary index)

DICT25.S    (small/core dictionary)

DICT25.U    (user dictionary - optional, created as words added)

To activate spell checking, set TXC.FLAGS4 = &H100 before calling XTEXT.

Misspelled words will be underlined in red; right-clicking on them will provide a list of similar words and an option to either add the word or ignore it. Added words go into the DICT25.U file, which will be created if it doesn't already exist.