Thanx so much for everyones input, something for me to consider and learn mroe about, i'd never even heard of co-opeartive multitasking, let along how to implement it in a pic/picaxe lol. (more reading for me).

Overall, to simplify my initial question/example, I wanted to know what preferred methods programmers use when it comes to nesting loops and how to interlace them in order of importance, like loop 1 (main) is the housekeeping loop, loop2 is the led matrix data, loop 3 and 4 read posts & switches, then a preferred structure of how loop1,2,3&4 would nest together for fastest (least interruptions) code operation.

I'm feeling Co-op multitasking is perhaps the best solution to consider? unless there's a general rule of thumb about nesting loops nicely to share time with eachother?

Thanx again,
Marty.