Sets the description for the section section_index. If the text is set to "" then the section will be hidden. The error flag will be set if an out of range section is specified.
section_index section_text
Section "" test_section_id
SectionEnd
Function .onInit
# change section's name to $WINDIR
SectionSetText ${test_section_id} $WINDIR
FunctionEnd
Added in NSIS v1.98