❓ DVAR

Hey there

I just want to ask you, if there is a dvar which checks, if a Client is alive or dead, like Client00 is alive = 1; Client00 is dead = 0.
If that really exist, could you help me and tell me, how I can find it (I already found out that 1 and 0 doesnt work :/) or if it even exist?

Thx alot