diff --git a/include/skeytsr.h b/include/skeytsr.h
new file mode 100755
index 000000000..3f63348a2
--- /dev/null
+++ b/include/skeytsr.h
@@ -0,0 +1,121 @@
+/* --------------------------------------------------------------------	*/
+/*									*/
+/*				EUTRON					*/
+/*									*/
+/*	   	Via Gandhi 12 - 24048 Treviolo BG -  Italy		*/
+/*									*/
+/*	Tel. +39-35-201003 - Fax +39-35-201277 - BBS +39-35-201144	*/
+/*									*/
+/* --------------------------------------------------------------------	*/
+/*									*/
+/*	Language    : C							*/
+/*	Application : SkeyTsr						*/
+/*	Module      : skeytsr.h						*/
+/*	Version     : 1.0						*/
+/*	Date	    : 18.4.1995						*/
+/*	Note	    : 							*/
+/*									*/
+/* --------------------------------------------------------------------	*/
+
+#ifndef	INC_SKEYTSR_H
+#define	INC_SKEYTSR_H
+
+/* --------------------------------------------------------------------	*/
+/* Smartkey mode codes							*/
+/* --------------------------------------------------------------------	*/
+
+#define	SCRAMBLING_MODE		's'
+#define	READING_MODE		'r'
+#define	WRITING_MODE		'w'
+#define	FIXING_MODE		'f'
+#define	LOCATING_MODE		'l'
+#define	COMPARING_MODE		'c'
+#define	PROGRAMMING_MODE	'p'
+#define	MODEL_READING_MODE	'm'
+#define	ENCRYPTING_MODE		'e'
+#define	BLOCK_READING_MODE	"br"
+#define	BLOCK_WRITING_MODE	"bw"
+
+/* --------------------------------------------------------------------	*/
+/* Smartkey models							*/
+/* --------------------------------------------------------------------	*/
+
+#define	SKEY_NONE	'0'		/* No Smartkey			*/
+#define SKEY_FX		'1'		/* Smartkey mod. FX		*/
+#define SKEY_PR		'2'		/* Smartkey mod. PR		*/
+#define SKEY_EP		'3'		/* Smartkey mod. EP		*/
+#define	SKEY_NET_5	'4'		/* Smartkey mod. NET 5 users	*/
+#define	SKEY_NET_10	'5'		/* Smartkey mod. NET 10 users	*/
+#define	SKEY_NET_25	'6'		/* Smartkey mod. NET 25 users	*/
+#define	SKEY_NET_50	'7'		/* Smartkey mod. NET 50 users	*/
+#define	SKEY_NET_NL	'8'		/* Smartkey mod. NET no limit	*/
+#define	SKEY_SP		'9'		/* Smartkey mod. SP		*/
+#define	SKEY_NET	'A'		/* Smartkey mod. NET		*/
+
+/* --------------------------------------------------------------------	*/
+/* Return codes								*/
+/* --------------------------------------------------------------------	*/
+
+#define ST_OK			0	/* No errors			*/
+#define ST_NONE_KEY		-1	/* No Smartkey present		*/
+#define ST_SYNT_ERR		-2	/* Syntax error			*/
+#define ST_LABEL_FAILED 	-3	/* Uncorrect label		*/
+#define ST_PW_DATA_FAILED	-4	/* Uncorrect password or data	*/
+#define ST_NET_ERROR		-5	/* Lan error			*/
+#define	ST_CLOSE_ERROR		-6	/* Attempting to CLOSE  without	*/
+					/* OPENing			*/
+#define ST_ACCESS_ERROR		-7	/* Attempting to ACCESS without	*/
+					/* OPENing			*/
+#define ST_USER_ERROR		-8	/* Max user reached 		*/
+#define	ST_NET_PWD_ERR		-9	/* Net password wrong		*/
+#define	ST_TSR_NOT_INST		-10	/* SKEYSRV not found		*/
+#define	ST_INIT_ERROR		-11	/* Insufficient PC memory	*/
+#define ST_PATH_ERR		-12	/* Path error or file not found */
+#define	ST_DRIVER_NOT_INST	-13	/* SKEYTSR not installed	*/
+#define	ST_TOO_MANY_OPEN_KEY	-14	/* Too many open SmartKey	*/
+#define	ST_NET_PASS_INVALID	-15	/* Invalid net password		*/
+#define	ST_HW_FAILURE		-20	/* Smartkey damaged		*/
+
+/* --------------------------------------------------------------------	*/
+/* Field length								*/
+/* --------------------------------------------------------------------	*/
+
+#define LABEL_LENGTH		16
+#define PASSWORD_LENGTH		16
+#define DATA_LENGTH		64
+#define EXTENDED_DATA_LENGTH	352
+#define	SCRAMBLE_LENGTH		8
+
+/* --------------------------------------------------------------------	*/
+/* --------------------------------------------------------------------	*/
+
+#define NET_KEY_OPEN		'O'
+#define NET_KEY_ACCESS		'A'
+#define NET_KEY_CLOSE		'C'
+#define USER_NUMBER_MODE	'U'
+
+/* --------------------------------------------------------------------	*/
+/* Communication structure definition					*/
+/* --------------------------------------------------------------------	*/
+
+typedef struct smartkey {
+	short		net_command;
+	unsigned long	net_password;
+	short		lpt;
+	short		command;
+	unsigned char	label[LABEL_LENGTH];
+	unsigned char	password[PASSWORD_LENGTH];
+	unsigned char	data[DATA_LENGTH];
+	short		fail_counter;
+	short		status;
+	unsigned char	ext_data[EXTENDED_DATA_LENGTH];
+} KEY_NET;
+
+/* --------------------------------------------------------------------	*/
+/* Interface function prototype						*/
+/* --------------------------------------------------------------------	*/
+
+
+short __far __pascal smartlink(KEY_NET __far *pSkey);
+
+#endif