Just be sure to restore them back before passing control back to Windows. Here's the skeleton program. If you don't understand some of the codes, don't panic. I'll explain each of them later. Let's analyze this skeleton program.
Programs have a main program that executes when the program loads into memory.
Units are simply a collection of data and procedures that you must link with other code. An executable file consists of exactly one program and zero or more units linked together. For the time being we will only write HLA code in program files. See the HLA documentation for more details about units. This statement tells the HLA compiler to include the HLA Standard Library Header files.