to find out what a weapon is, you really need to have the military "knowledge", which only comes from researching the subject matter. There is just not enough space to effectively print a copy of "Janes Weapon Systems" in the GG. (I used to have a copy of Janes Infantry Weapons for 76-77, and it weighed about 10 lbs!

. And each volume of Janes requires a mortgage to aquire..
Your best bet is to type "hydra FFAR" into google. Also - to find a nice online website which deals with military acronyms. Fas.org should have one somewhere in its site?.
A quick google of "FFAR" pointed at the fas.org entry for the Hydra series of rockets :
Hydra FFAR
Also try globalsecurity.org
link
All air Rockets in the game are stated as (X x Name of system) as the "salvo" unit - can be 1 for e.g. the big Soviet 122mm, or 7-8 70mm ones. That allows the 16, 32 rocket pods to be simukated without a separate weapon slo used up for each pod.
Thw W key will
only fire one weapon, at the
currently selected target and
only if the selected weapon is in range
and has ammo
and a shot opportunity remaining that turn. About the only use I have for this function is to have one of my Russian Guards sections to launch an AT-mine at a tank next door in WinSPWW2,
without triggering a close assault which may leave them too supressed to fling a second one if the first failed. Otherwise, I turn off the weapons I do not want to fire the usual way (in the odd circumstance I want to reserve some, about the only time I do that is to preserve an ATGM and biff up a light APC target e.g with the BMPs 30mm and hold the missile) and simply click on the target to fire.
The T key dialogue needs therefore to be used with N and P to navigate to the desired target if no target/not the desired target is currently selected. Again - the only time I use this instead of clicking on the target may be to select a tank for a rifle section to fling an AT weapon at, or perhaps to review the %age to-hit the gunner thinks is best, if selecting between which T-55 to target etc. (Remember that the to-hit %age in the T key dialogue only works for the primary (slot 1) weapon).
Out of contact status is determined at your turn
start and the range for guaranteed comms is
shouting range between the platoon commander and the sub-unit - 100-150 metres or 2-3 hexes. Any other distance needs both units to have a radio and to pass a radio comms test. You can also be out of contact if the platoon HQ is dead, retreating etc. (Command radius is also irrelevant, if you do not have any need to rally the sub-units that turn.)
cheers
Andy