You can run the Hardware Simulator from command line (cmd.exe / terminal).
[D:/TECS/projects/test]
% cat And.hdl
CHIP And {
IN a, b;
OUT out;
PARTS:
// Put your code here:
Nand(a=a, b=b, put=out); // A common typo I make 8-(
}
[D:/TECS/projects/test]
% HardwareSimulator And.tst
In HDL file D:\TECS\projects\test\And.hdl, Line 7, put is not a pin in Nand: loa
d And.hdl
[D:/TECS/projects/test]
--Mark