|You might post a question the the Linux forum and see if anyone there can offer any assistance.|
And, since you do not have the F keys,
the best I can offer, is that the key sequences of:
DEL, or ESC, pressed at the proper moment,
as well as key combinations of CTRL + ALT + ESC or CTRL + ALT + DEL,
have been used in the past by some companies.
You might give them a try.
On a such an obscure, 15 year old system, good luck.