Press any key to move past the opening screen. There is an in-game briefing option, or you can press F1 for Help. This version also has an option to view the complete documentation without leaving the game.
I still have print-outs of the documentation, and have reproduced the game's "cheat sheet" below.
EGA TREK COMMAND QUICK REFERENCE
Acknowledge all messages
manual refresh of Chart of known galaxy
Dock with a StarBase
control Fixing of systems
Move to quad/sector
standard Orbit around planet
state of Repair report
fire photon Torpedos
set Warp speed
Hail a StarBase
Helpful list of all available commands
Info on enemy in current quadrant
Land on and explore a planet
divert Maximum energy to shields
review old Messages
use death Ray weapon
toggle Sound on/off
Use miscellaneous item
EDIT: I have verified that the save game feature works in the DosBox emulator, which is great news because you'll need it at the harder difficulty levels. You are given the option to load a saved game when you reload the game.