Halcyon Systems, a Dublin-based software company, has signed a deal with Citicorp Information Technologies and Industries Limited (CITIL) to provide local support and implementation services to CITIL's customers in the Republic and in Bri tain. Halycon's contract also involves the development of new business in these markets. CITIL, which has its headquarters in India, evolved from a Citicorp initiative in the 1980s to develop software for the US financial services group's internal needs.