Communicating between two UNO cards

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hi,

i establish communication between 2 uno cards:

uno1 sends data such arrays entries example uno card uno2 can use data generated in uno1 on uno2 card.

can done via usb? mounting usb module on both uno1 , uno2 send info?
do need intermediate step via file system?

or best use tx , rx on uno1 , receive data on uno2 via usb onn uno2?

thanks.
 

the uno has single hardware serial port works on pins 0 , 1 , simultaneously via usb pc.

if don't need either uno connected pc can connect them using rx tx , tx rx , gnd gnd,

if want 1 or both of unos connect pc on usb can use softwareserial create anothe serial port on pair of i/o pins.

...r


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