The PARTICIPATE option is used to indicate that the program specifies the option of accepting or rejecting offers, through the RESPOND statement, when the subfile is matched to an incoming dialog request. Specifying PARTICIPATE is equivalent to specifying PARTICIPATE = TRUE. Upon notification of a matching dialog request, through CHANGEEVENT and FILESTATE attributes, the program can interrogate the value of attributes, read open user data, and negotiate the value of negotiable attributes. The program can then reject or accept an incoming dialog request. For more information on FILESTATE and CHANGEEVENT attributes, see the File Attributes Programming Reference Manual. If the PARTICIPATE option is not included, a default value of FALSE is assumed, and any offer is unconditionally accepted.