Daniel East will be the presenter at the Tuesday, Sept. 14 meeting of the Maryland Apple Corps. He’ll present “Upgrading Your OS: How, Why and When –- with an introduction to Tiger, Mac OS 10.4” along with MaMUGs’ “Tech 911” and the latest Apple and Mac news. East is president and founder of The Mid-Atlantic Apple/Macintosh User Groups Team (MaMUGs) and co-host of “PC Talk Radio” with Levin Communications. The Sept. 14th meeting will be held at the Towson Public Library, 320 York Road, Towson, MD , starting at 6:30 p.m. ET.