pseudoxristos,
From the beginning, the purpose was for NGOs associated with UN-DPI to "support the work of the United Nations."
From http://www.un.org/MoreInfo/ngolink/brochure.htm:
The importance of working with and through NGOs as an integral part of United Nations information activities was recognized when the Department of Public Information was first established in 1946. The General Assembly, in its resolution 13 (I), instructed DPI and its branch offices to:"...actively assist and encourage national information services, educational institutions and other governmental and non-governmental organizations of all kinds interested in spreading information about the United Nations. For this and other purposes, it should operate a fully equipped reference service, brief or supply lecturers, and make available its publications, documentary films, film strips, posters and other exhibits for use by these agencies and organizations."
In 1968, the Economic and Social Council, by Resolution 1297 (XLIV) of 27 May, called on DPI to associate NGOs, bearing in mind the letter and spirit of its Resolution 1296 (XLIV) of 23 May 1968, which stated that an NGO "...shall undertake to support the work of the United Nations and to promote knowledge of its principles and activities, in accordance with its own aims and purposes and the nature and scope of its competence and activities".
Notice the third paragraph:
In 1968, the Economic and Social Council, by Resolution 1297 (XLIV) of 27 May, called on DPI to associate NGOs, bearing in mind the letter and spirit of its Resolution 1296 (XLIV) of 23 May 1968, which stated that an NGO "...shall undertake to support the work of the United Nations and to promote knowledge of its principles and activities, in accordance with its own aims and purposes and the nature and scope of its competence and activities".
TS,