So ive looked everywhere, i found a thread on the forums dated about a year ago with someone asking the same question. I wanted to Dual box and have my screen split basically down the middle, Horizontal or vertical doesnt matter. Im semi-new to macs, and cant get anything to resize my frames the way i want. They only drag diagonal. Ive been dual boxing using the expose/space feature but it causes alot of lag almost unplayable. If anyone has any info that can help would love to hear it, Thx.