I had to install a new patch to an old Sun Microsystems computer yesterday. It was fairly straightforward, I just had to type out exactly what was written in the set of instructions I was given by the company issuing out the upgrade. My question is, what function do the arrow keys have when typing in code. The screen was all white and the screen appeared to flash black and white several times, towards the top of the screen every time I pressed the arrow keys (I was trying to bring the last line of code back up because I had made a mistake and didn't want to have to re-write the whole thing again but I guess that's only in MS-DOS which I'm more familiar with)? So anybody know what the flashing black and white screen signifies and also what purpose (if any), the curser keys have when typing in code in that "MS-DOS looky-like" screen?

oh and this was in CMS, running off Sun