what is union REGS

in am working on a detect mouse programme there is a line in that programme can anyone tell me what is this ?

 
  union REGS in, out; //REGS is a union 
It defines two REGS objects, in and out.
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You should look at your compiler's documentation before posting questions like this.

It is a structure to hold the values of all the 16-bit x86 hardware registers for use in functions that generate or capture hardware interrupts.
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