Ok, how do I determine which version of routerOS I'm running? Webfig/cmd line/whatever?

JT

Open winbox and click in "..." you will have the list of all boards in your network and the version.
Take a cofffffeeeeeeee!

I see it is also available on /system resources print

[admin@MikroTik] > /system resource print
uptime: 23h32m6s
version: 5.4
free-memory: 18024KiB
total-memory: 29708KiB
cpu: MIPS 24Kc V7.4
cpu-count: 1
cpu-frequency: 400MHz
cpu-load: 4%
free-hdd-space: 32236KiB
total-hdd-space: 61440KiB
write-sect-since-reboot: 448
write-sect-total: 2031
bad-blocks: 0%
architecture-name: mipsbe
board-name: RB750
platform: MikroTik

And on the login banner for cmd line access.