If I close C.A.T. and open it later, then "Load Markets PingPong Parameter," will C.A.T. be able to ingest my open orders on Crypsty?
I have about a thousand open orders on C.A.T. and I need to restart my computer.
Actually no

Difficulty part is not the "reload" of current orders. Difficult part is load/save all the "old" environment......
Then what should he do when he needs to reboot his machine? Manually close all orders?
I Suggest this kind of steps :
- Close all marketks where there are no Ping-Pong/Trade active (you will see empty table).
- Set the rest of markets in "Return All To BTC Mode" or "Retrn all to Alternative Currency Mode"
After that i think you will have less markets working.
Then you can close all cryptsy orders and stop C.A.t.