(a)
Err SysLibFind(CharPtr libName, Word *refNum);

(b)
Err IrOpen(Word refnum, DWord options);
Err IrClose(Word refnum);

(c)
IrStatus IrBind (UInt refNum, IrConnect* con, IrCallBack CallBack);
IrStatus IrUnbind (UInt refNum, IrConnect* con);

(d)
typedef void (*IrCallBack)(IrConnect* con, IrCallbackParms* irData);

(e)
IrStatus IrSetDeviceInfo(UInt refnum, BytePtr info, Byte len);

Example 1: (a) The SysLibFind() prototype; (b) IrOpen() and IrClose() prototypes; (c) prototypes for IrBind() and IrUnbind(); (d) IrCallBack()'s definition; (e) IrSetDevice() prototype.