IN 1969, under the authority of the then president Charles Helou, the following document was signed by the Head of the Lebanese Delegation General Emile Bustani, and the Head of the Palestinian Delegation Yasser Arafat. Many felt this document was a mistake of such proportions that it lead to the outbreak of  war in Lebanon.

Text 

On Monday, 3rd November 1969, the Lebanese delegation headed by Army Commander General Emile al-Bustani, and the Palestine Liberation Organization delegation, headed by Mr. Yasir 'Arafat, chairman of the organization, met in Cairo in the presence of the United Arab Republic Minister of Foreign Affairs Mahmud Riyad, and the War Minister, General Muhammad Fawzi. 
In consonance with the bonds of brotherhood and common destiny, relations between Lebanon and the Palestinian revolution must always be conducted on the bases of confidence, frankness, and positive cooperation for the benefit of Lebanon and the Palestinian revolution and within the framework of Lebanon's sovereignty and security. The two delegations agreed on the following principles and measures:

The Palestinian Presence

It was agreed to reorganize the Palestinian presence in Lebanon on the following bases:
1. The right to work, residence, and movement for Palestinians currently residing in Lebanon;
2. The formation of local committees composed of Palestinians in the camps to care for the interests of Palestinians residing in these camps in cooperation with the local Lebanese authorities within the framework of Lebanese sovereignty;
3. The establishment of posts of the Palestinian Armed Struggle [PASC] inside the camps for the purpose of cooperation with the local committees to ensure good relations with the Lebanese authorities. These posts shall undertake the task of regulating and determining the presence of arms in the camps within the framework of Lebanese security and the interests of the Palestinian revolution;
4. Palestinians resident in Lebanon are to be permitted to participate in the Palestinian revolution through the Armed Struggle and in accordance with the principles of the sovereignty and security of Lebanon.

Commando Activity

It was agreed to facilitate commando activity by means of:
1. Facilitating the passage of commandos and specifying points of passage and reconnaissance in the border areas;
2. Safeguarding the road to the 'Arqub region;
3. The Armed Struggle shall undertake to control the conduct of all the members of its organizations and [to ensure] their non-interference in Lebanese affairs;
4. Establishing a joint command control of the Armed Struggle and the Lebanese Army;
5. Ending the propaganda campaigns by both sides;
6. Conducting a census of Armed Struggle personnel in Lebanon by their command.
7. Appointing Armed Struggle representatives at Lebanese Army headquarters to participate in the resolution of all emergency matters;
8. Studying the distribution of all suitable points of concentration in border areas which will be agreed with the Lebanese Army command;
9. Regulating the entry, exit, and circulation of Armed Struggle personnel;
10. Removal of the Jiyrun base.
11. The Lebanese Army shall facilitate the operation of medical, evacuation, and supply centers for commando activity;
12. Releasing detained personnel and confiscated arms;
13. It is understood that the Lebanese authorities, both civil and military, shall continue to exercise all their prerogatives and responsibilities in all areas of Lebanon in all circumstances;
14. The two delegations affirm that the Palestinian armed struggle is in the interest of Lebanon as well as in that of the Palestinian revolution and all Arabs;
15. This agreement shall remain Top Secret and for the eyes of the commands only.

Head of Lebanese delegation
Emile Bustani

Head of Palestinian delegation
Yasir Arafat

Resolution adopted by the Lebanese Chamber of Deputies, 21 May 1987

1. Abrogation of the law issued by the Chamber of Deputies on 14 June 1983, authorizing the Government to ratify the agreement signed by the Government of the Lebanese Republic and the Government of the State of Israel on 17 May 1983.
2. The agreement signed on 3 November 1969 between the head of the Lebanese delegation General Emile Bustani and the Chairman of the PLO and which is known as the "Cairo Agreement" is hereby null and void as if it had never existed. Further, all annexes and measures related to the Cairo Agreement are hereby null and void as if they had never existed.
3. This law will become effective upon its publication in the Official Gazette.

3 نوفمبر ( تشرين ثاني ) 1969