Conio.h (sometimes called CONIO.H) is an include file found in C programming environments on MS-DOS and Windows systems. By way of Extremely Clever Preprocessor Voodoo (ECPV), it converts any Microsoft C compiler into a QBASIC compiler: Without CONIO.H, you only have the incredibly difficult-to-use C programming language: Output: Hello World With it, Microsoft's advanced QBASIC language instantly becomes available! Output: Hello, Philippines! ...and about a pint of semen.