The system call (''syscall'') mechanism is used by an application applications to access kernel services.  High-level languages will wrap the syscall interface in basic wrappers or more advanced mechanisms. For example, in C, the ''write'' syscall can be accessed through the <code>write()</code> wrapper, or through more complex functions such as <code>printf()</code>. [[Assembly Language|Assembly language]] programs will often access syscalls directly.