Open a file for reading and writing. zMUD provides 10 files. Files numbered 1-5 are text files that can be read sequentially, or appended to. Files numbered 6-10 are string record files that can be read and written randomly. If the numbered file is already opened, the previous file is closed. The filename given in name is restricted to the current directory containing ZMUD.EXE and cannot refer to a EXE, HLP, or MUD file. This protects you from accidentally modifying important files on your disk.
If used without any arguments, the names of all open files are displayed.