The end result is that others in your field will know your name. But sometimes it is the last and only part read. Fill in all of the blanks. It is a summary of each part of the proposal - not a repetition of what has already been written. If your summary is not succinct and motivating, you have lost the reviewer.
Many forms have explicit directions.
Appendix First check funding source rules for appendix format. Generally, in the appendix, you are to present reference materials that will back up your proposal. The cover letter is the last part of the proposal to be written, but may be the first part read by the funding source. An unsolicited proposal is one which is not sent in relation to any particular request and is not developed in response to any regular grant program. Usually, an unsolicited proposal is developed by an institution for an agency in response to a perceived need.