diff --git a/main.cpp b/main.cpp
index b8e81ddd..fc4f537e 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,29 +1,7 @@
 #include "pip.h"
 
-class Base: public PIObject {
-	PIOBJECT(Base)
-public:
-	EVENT_HANDLER(void, tick) {piCout << "tick";}
-};
 
 int main() {
-	Base b;
-	PIConnection c;
-	c.configureFromConfig("d:/orders/nicirt/bin/spec_core.conf", "core");
-	//CONNECTU(&t, tickEvent, &b, tick);
-	piCout << "start ...";
-	c.start();
-	//t.start(500);
-	piSleep(3);
-	//t.stop();
-	//delete t;
-	c.stop();
-	piCout << "deleted";
-
-	/*PIEthernet * eth = PIIODevice::createFromFullPath("eth://UDP:::192.168.0.33:16666")->cast<PIEthernet>();
-	for (;;) {
-		eth->send(PIByteArray::fromHex("00112233445566778899"));
-		piSleep(1.5);
-	}*/
+	PISystemInfo::machineID();
 	return 0;
 }
diff --git a/src_main/core/piinit.cpp b/src_main/core/piinit.cpp
index 06828aa2..fc29d548 100644
--- a/src_main/core/piinit.cpp
+++ b/src_main/core/piinit.cpp
@@ -231,8 +231,8 @@ PIInit::PIInit() {
 	GetSystemInfo(&sysinfo);
 	sinfo->processorsCount = sysinfo.dwNumberOfProcessors;
 	switch (sysinfo.wProcessorArchitecture) {
-	case PROCESSOR_ARCHITECTURE_AMD64: sinfo->architecture = PIStringAscii("x64"); break;
-	case PROCESSOR_ARCHITECTURE_ARM: sinfo->architecture = PIStringAscii("ARM"); break;
+	case PROCESSOR_ARCHITECTURE_AMD64: sinfo->architecture = PIStringAscii("x86_64"); break;
+	case PROCESSOR_ARCHITECTURE_ARM: sinfo->architecture = PIStringAscii("arm"); break;
 	case PROCESSOR_ARCHITECTURE_IA64: sinfo->architecture = PIStringAscii("Intel Itanium-based"); break;
 	case PROCESSOR_ARCHITECTURE_INTEL: sinfo->architecture = PIStringAscii("x86"); break;
 	case PROCESSOR_ARCHITECTURE_UNKNOWN:
diff --git a/src_main/core/pistring.cpp b/src_main/core/pistring.cpp
index b33a3a70..c4c845c8 100755
--- a/src_main/core/pistring.cpp
+++ b/src_main/core/pistring.cpp
@@ -438,6 +438,7 @@ PIByteArray PIString::toCharset(const char * c) const {
 
 
 PIString & PIString::operator +=(const char * str) {
+	if (!str) return *this;
 	int l = 0;
 	while (str[l] != '\0') ++l;
 	appendFromChars(str, l);
@@ -446,6 +447,7 @@ PIString & PIString::operator +=(const char * str) {
 
 
 PIString & PIString::operator +=(const wchar_t * str) {
+	if (!str) return *this;
 	//cout << "wc" << endl;
 	/*int l = 0, sz;
 	char * c = new char[MB_CUR_MAX];
diff --git a/src_main/io_devices/pidir.cpp b/src_main/io_devices/pidir.cpp
index b5062624..7c47ccfd 100755
--- a/src_main/io_devices/pidir.cpp
+++ b/src_main/io_devices/pidir.cpp
@@ -396,11 +396,17 @@ PIDir PIDir::home() {
 		delete[] rc;
 		return PIDir();
 	}
-	PIString s(rc);
-	s.replaceAll("\\", PIDir::separator);
+	PIString hp(rc);
+	memset(rc, 0, 1024);
+	if (ExpandEnvironmentStrings((LPCTSTR)"%HOMEDRIVE%", (LPTSTR)rc, 1024) == 0) {
+		delete[] rc;
+		return PIDir();
+	}
+	PIString hd(rc);
+	hp.replaceAll("\\", PIDir::separator);
 	delete[] rc;
-	s.prepend(separator);
-	return PIDir(s);
+	//s.prepend(separator);
+	return PIDir(hd + hp);
 #else
 #  ifndef ESP_PLATFORM
 	rc = getenv("HOME");
diff --git a/src_main/io_devices/piethernet.cpp b/src_main/io_devices/piethernet.cpp
index 6080447c..eb230331 100755
--- a/src_main/io_devices/piethernet.cpp
+++ b/src_main/io_devices/piethernet.cpp
@@ -1110,17 +1110,19 @@ PIEthernet::InterfaceList PIEthernet::interfaces() {
 	PIStringList inl;
 	struct ifreq ir;
 	for (int i = 0; i < icnt; ++i) {
+		ci.flags = 0;
 		PIString in = PIStringAscii(ifc.ifc_req[i].ifr_name);
 		if (in.isEmpty()) continue;
 		ci.name = in;
 		strcpy(ir.ifr_name, in.dataAscii());
 		if (ioctl(s, SIOCGIFHWADDR, &ir) == 0)
-		ci.mac = macFromBytes(PIByteArray(ir.ifr_hwaddr.sa_data, 6));
+			ci.mac = macFromBytes(PIByteArray(ir.ifr_hwaddr.sa_data, 6));
 		if (ioctl(s, SIOCGIFADDR, &ir) >= 0)
 			ci.address = getSockAddr(&ir.ifr_addr);
 		if (ioctl(s, SIOCGIFNETMASK, &ir) >= 0)
 			ci.netmask = getSockAddr(&ir.ifr_addr);
 		ioctl(s, SIOCGIFMTU, &ci.mtu);
+		if (ci.address == "127.0.0.1") ci.flags |= PIEthernet::ifLoopback;
 		il << ci;
 	}
 	delete ifc.ifc_buf;
diff --git a/src_main/system/pisysteminfo.cpp b/src_main/system/pisysteminfo.cpp
index 01b6122f..59ce122f 100644
--- a/src_main/system/pisysteminfo.cpp
+++ b/src_main/system/pisysteminfo.cpp
@@ -18,12 +18,16 @@
 */
 #include "pisysteminfo.h"
 #include "piincludes_p.h"
+#include "pidir.h"
+#include "picrc.h"
 
 #ifdef ESP_PLATFORM
 #  include "esp_system.h"
 #  include "esp_spi_flash.h"
 #endif
 
+#define SALT_SIZE 8
+
 
 PISystemInfo::PISystemInfo() {
 	processorsCount = 1;
@@ -196,3 +200,66 @@ PIVector<PISystemInfo::MountInfo> PISystemInfo::mountInfo() {
 	cache = ret;
 	return ret;
 }
+
+PIString confDir() {
+	return
+#ifdef WINDOWS
+			PIDir::home().path() + "/AppData/Local"
+#elif ANDROID
+			"/mnt/sdcard"
+#else
+			PIDir::home().path() + "/.config"
+#endif
+			;
+}
+
+
+PIByteArray generateSalt() {
+	PIByteArray ret;
+	piForTimes (SALT_SIZE) {
+		piMSleep(randomi() % 10);
+		randomize();
+		ret << uchar(randomi() % 0x100);
+	}
+	return ret;
+}
+
+
+PIString PISystemInfo::machineKey() {
+	static PIString ret;
+	if (ret.isEmpty()) {
+		PISystemInfo * si = instance();
+		PIByteArray salt;
+		PIString conf = confDir() + "/.pip_machine_salt";
+		if (PIFile::isExists(conf)) {
+			PIFile f(conf, PIIODevice::ReadOnly);
+			f.open();
+			salt = f.readAll();
+		}
+		if (salt.size_s() != SALT_SIZE){
+			salt = generateSalt();
+			PIFile f(conf, PIIODevice::ReadWrite);
+			f.open();
+			f.clear();
+			f.write(salt);
+		}
+		ret = si->OS_name + "_" + si->architecture + "_" + si->hostname + "_" + salt.toHex();
+		/*PIEthernet::InterfaceList il = PIEthernet::interfaces();
+		const PIEthernet::Interface * lo = il.getByAddress("127.0.0.1");
+		if (lo)
+			ret += lo->mac;*/
+	}
+	return ret;
+}
+
+
+uint PISystemInfo::machineID() {
+	piCout << confDir();
+	static uint ret = 0;
+	if (ret == 0) {
+		CRC_32 crc = standardCRC_32();
+		ret = crc.calculate(machineKey().toByteArray());
+		piCout << "machineID \"" << machineKey() << "\" =" << PICoutManipulators::Hex << ret;
+	}
+	return ret;
+}
diff --git a/src_main/system/pisysteminfo.h b/src_main/system/pisysteminfo.h
index aedfe321..a2490a7f 100644
--- a/src_main/system/pisysteminfo.h
+++ b/src_main/system/pisysteminfo.h
@@ -43,6 +43,8 @@ public:
 	
 	static PIStringList mountRoots();
 	static PIVector<MountInfo> mountInfo();
+	static PIString machineKey();
+	static uint machineID();
 	
 	static PISystemInfo * instance();
 	
diff --git a/utils/crypt_tool/main.cpp b/utils/crypt_tool/main.cpp
index 50749e57..c05f108b 100644
--- a/utils/crypt_tool/main.cpp
+++ b/utils/crypt_tool/main.cpp
@@ -25,6 +25,7 @@ void usage() {
 
 
 int main (int argc, char * argv[]) {
+	PICrypt::hash("");
 	PICrypt crypt;
 	PIByteArray bout;
 	PICLI cli(argc, argv);