fly fs9 on two PCs in same room

First, thanks to Paul & wealthyspoon for unraveling my freebee aircraft viewing quirey.
Without trying to teach grannys how to suck eggs, for anyone else wanting to practice formation flying, I found that by running fs9 on my two PCs and :
Both
1. same field
2. same fs9 Flt.Plan (speeds 180kt) with Star at destination
Then
1. I take off the Second PC
2. join it on same Bband fs9 multiplay
3. put it on fsNav A/Pilot & FlyPP
I take off on first PC, join on fs9 & fsNav multiplays and go find the first one to practise formating on.
For some reason not both PCs can join on fsNav multiplay, so I only join the one I fly. Can anybody advise on this? luke
Without trying to teach grannys how to suck eggs, for anyone else wanting to practice formation flying, I found that by running fs9 on my two PCs and :
Both
1. same field
2. same fs9 Flt.Plan (speeds 180kt) with Star at destination
Then
1. I take off the Second PC
2. join it on same Bband fs9 multiplay
3. put it on fsNav A/Pilot & FlyPP
I take off on first PC, join on fs9 & fsNav multiplays and go find the first one to practise formating on.
For some reason not both PCs can join on fsNav multiplay, so I only join the one I fly. Can anybody advise on this? luke