| 0x0001 | `nx_fs_open` | Opens the file at the _len_ bytes long path _path_ and writes a file descriptor to the referenced file into _fd_ (which needs to be a pointer). | path | len | *fd | | status | Implemented |
| 0x0002 | `nx_fs_close` | Closes the file which is indicated by descriptor _fd_. This should always be called, otherwise the OS will have to unload files without knowledge of usage. | fd | | | | status | Implemented |
| 0x0003 | `nx_fs_read` | Reads at most _n_ bytes from a file given as descriptor _fd_ and at a specific position _offset_ into a given memory region _mem_. | fd | offset | mem | n | status | Implemented |
| 0x0004 | `nx_fs_write` | Writes _n_ bytes from a given memory region _mem_ into the file referenced by _fd_ at the given position _offset_, not inserting but either overwriting existing content or appending to the file. | fd | offset | mem | n | status | Implemented |
| 0x0005 | `nx_fs_delete` | Completely delete the file or folder at a given path _path_, which is _len_ bytes long. | path | len | | | status | Implemented |
| 0x0006 | `nx_fs_list` | List all files and/or directories at the _len_ bytes long path _path_ and write their NULL-separated names into _mem_. When _mem_ is NULL, _needed_mem_ (which needs to be a pointer to an 32-bit integer) is filled with the appropriate value. | path | len | mem | *needed_mem | status | Implemented |
| 0x0007 | `nx_fs_info` | Writes the information about the files attribute _attr_ into mem. Types of attributes are described below. | fd | attr | mem | | status | N/A |
| 0x0101 | `nx_mem_alloc` | Maps _n_ 4KB pages to address _addr_. You can provide a bitmap of flags with the _flags_ argument. Which flags can be used, is described below. | addr | n | flags | | status | Implemented |
| 0x0102 | `nx_mem_free` | Unmaps _n_ 4KB pages at address _addr_. | addr | n | | | status | Implemented |
| 0x0103 | `nx_mem_label` | Gives a memory region a file descriptor, called a label, which can then be used for example for executing executable data in that memory region in a new process | addr | len | *fd | | status | N/A |
| 0x0104 | `nx_mem_unlabel` | Takes the file descriptor away from a memory region. | fd | | | | status | N/A |
| 0x0201 | `nx_proc_create` | Creates a new process with the configuration _conf_ (which format is described below) and writes its process id to _pid_. | *conf | *pid | | | status | N/A |
| 0x0202 | `nx_proc_signal_send` | Send the signal _signal_ to _pid_. See below for a list of signals. | pid | signal | | | status | N/A |
| 0x0203 | `nx_proc_signal_set_handler` | Sets a handler for the signal _signal_ in the current process. Not all signals can have a handler. Look at the list for more information. | signal | *handler | | | status | N/A |
| 0x0204 | `nx_proc_thread_create` | Spawns a new thread for the current process. The starting point is defined by _addr_. The threads' ID is written into _tid_. | addr | *tid | | | status | N/A |
| 0x0205 | `nx_proc_thread_start` | Starts the current processes' thread with thread id _tid_. | tid | | | | status | N/A |
| 0x0206 | `nx_proc_thread_pause` | Pauses the current processes' thread with thread id _tid_. | tid | | | | status | N/A |
| 0x0207 | `nx_proc_thread_kill` | Kills the current processes' thread with thread id _tid_. | tid | | | | status | N/A |
| 0x0301 | `nx_drv_register` | Registers the executable at the file descriptor _fd_ as driver. The drivers' ID will be written into _id_. | fd | *id | | | status | Implemented |
| 0xFF01 | `nx_kernel_scheduler_start` | Starts the kernel scheduler. The current execution point will be the kernel processes' first thread. | | | | | | Implemented |
| 0xFF02 | `nx_kernel_panic` | Causes a kernel panic. With _msg_ as error message. | msg | | | | | Implemented |
