The following program segment displays the man page for the grep command. It also sets the size of the dialog to better suit a man page.
ac = 0; XtSetArg (al[ac], DtNhelpType, DtHELP_TYPE_MAN_PAGE); ac++; XtSetArg (al[ac], DtNmanPage, "grep"); ac++; XtSetArg (al[ac], DtNcolumns, 80); ac++; XtSetArg (al[ac], DtNrows, 20); ac++; XtSetValues (quickHelpDialog, al, ac); XtManageChild (quickHelpDialog);