I love adding new words to my vocabulary so I looked this one up.Originally Posted by Magnus
1 : MASTER KEY
2 a : 5MAT b : a method of framing in which a picture, a mat, a glass, and a back (as of cardboard) are held together by strips of paper or cloth pasted over the edges
3 : a strong paper gummed on one side and used especially for mounting pictures
Thanks to all who have responded to this thread, I always learn something at APUG.ORG.