Hi. I actually haven't tried on ArcaOS these two.
Ctrl+Shift+F1 : To suppress auto-start for the current boot only, press Ctrl+Shift+F1 when the single-color desktop background (without any icons) first appears, and hold these keys down until your desktop icons appear on the screen.
Note that you must use the left shift key, not the right shift key when performing this hot-key sequence.
Ctrl+Alt+Num Lock (Twice) : You can capture the OS/2 Trap screen by pressing Ctrl+Alt+Num Lock (twice). Insert a blank diskette and wait until it's filled up, then reboot the machine. In e.exe or epm.exe, open the binary soup and look for the trap screen. Copy paste it.
I will check it out, any additional comments are welcome.
Regards