Module Checkit {
      Module Multiply (a, b) {
            Push a*b
      }
      Multiply 10, 5
      Print Number=50

      Module Multiply {
            Push Number*Number
      }

      Multiply 10, 5
      Print Number=50
      \\ push before call
      Push 10, 5
      Multiply
      Read A
      Print A=50
      Push 10, 2,3 : Multiply : Multiply: Print Number=60
      Module Multiply {
            If not match("NN") Then Error "I nead two numbers"
            Read a, b
            Push a*b
      }
      Call Multiply 10, 5
      Print Number=50
      \\ now there are two values in stack 20 and 50
      Multiply
}
Call Checkit, 20, 50
Print Number=1000