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By using a specific trigger after redirection you can trick the game into allowing you to read data of other players.
Additionally you can also use variable assignment to modify their variables directly.
Note that besides sysvar(0) which is modified by FVar(40) := X
Sysvar(1)-SysFVar(4) cannot be modified in this way.
Examples
1. Root,Cond(Var(0) ;= 12345, 1, 1)
Outcome of the Cond affects trigger truthiness and parameter values.
This sets Root,Var(0) to 12345.