25 ILCS 15/1

(25 ILCS 15/1) (from Ch. 63, par. 191)

Sec. 1.

A special session of the General Assembly may be convened at any time by
a joint proclamation issued by the Speaker of the House of Representatives
and the President of the Senate, stating the purpose of the session and the
date and time for the session, and filed with the Secretary of State and by
notice to the members as provided in Section 2. Only business encompassed
by the purpose stated in the joint proclamation, together with any
impeachments or confirmation of appointments, may be transacted at the
special session.

(Source: P.A. 77-1783.)