diff --git a/CoreVersions/Baikal_0.1/Frameworks/Baikal/Core/Bootstrap.php b/CoreVersions/Baikal_0.1/Frameworks/Baikal/Core/Bootstrap.php
index b48da1f..9059325 100644
--- a/CoreVersions/Baikal_0.1/Frameworks/Baikal/Core/Bootstrap.php
+++ b/CoreVersions/Baikal_0.1/Frameworks/Baikal/Core/Bootstrap.php
@@ -106,6 +106,7 @@ $sDirName = appendSlash(dirname($sScript));
 $sBaseUrl = appendSlash(substr($sDirName, 0, -1 * strlen(BAIKAL_CONTEXT_BASEURI)));
 $aParts = explode("/", $_SERVER["SERVER_PROTOCOL"]);
 $sProtocol = strtolower(array_shift($aParts));
+define("BAIKAL_BASEURI", $sBaseUrl);
 define("BAIKAL_URI", $sProtocol . "://" . rmEndSlash($_SERVER["HTTP_HOST"]) . $sBaseUrl);
 unset($sScript); unset($sDirName); unset($sBaseUrl); unset($sProtocol); unset($aParts);
 
@@ -136,11 +137,8 @@ if(
 			if(!defined("BAIKAL_ADMIN_PASSWORDHASH")) {
 				installTool();
 			}
-
-			# Check that DB exists
-			if(!file_exists(BAIKAL_SQLITE_FILE)) {
-				die("DB file does not exist.<br />To create it, please copy '<b>Core/Resources/baikal.empty.sqlite</b>' to '<b>Specific/db/baikal.sqlite</b>'.<br /><span style='color: red; font-weight: bold'>Please note the change in the file name while doing so</span> (from 'baikal.empty.sqlite' to 'baikal.sqlite').");
-			}
+			
+			\Baikal\Core\Tools::assertEnvironmentIsOk();
 
 			# Database
 			$pdo = new PDO('sqlite:' . BAIKAL_SQLITE_FILE);
diff --git a/CoreVersions/Baikal_0.1/Frameworks/Baikal/Core/Tools.php b/CoreVersions/Baikal_0.1/Frameworks/Baikal/Core/Tools.php
index 616d194..ce879cd 100644
--- a/CoreVersions/Baikal_0.1/Frameworks/Baikal/Core/Tools.php
+++ b/CoreVersions/Baikal_0.1/Frameworks/Baikal/Core/Tools.php
@@ -31,6 +31,54 @@ class Tools {
 		return $GLOBALS["pdo"];
 	}
 	
+	public static function assertEnvironmentIsOk() {
+
+		# Asserting DB file exists
+		if(!file_exists(BAIKAL_SQLITE_FILE)) {
+			throw new \Exception("DB file does not exist. To create it, please copy 'Core/Resources/baikal.empty.sqlite' to 'Specific/db/baikal.sqlite'.");
+		}
+		
+		# Asserting DB file is readable
+		if(!is_readable(BAIKAL_SQLITE_FILE)) {
+			throw new \Exception("DB file is not readable. Please give read permissions to httpd user on file 'Specific/db/baikal.sqlite'.");
+		}
+		
+		# Asserting DB file is writable
+		if(!is_writable(BAIKAL_SQLITE_FILE)) {
+			throw new \Exception("DB file is not writable. Please give write permissions to httpd user on file 'Specific/db/baikal.sqlite'.");
+		}
+		
+		# Asserting config file exists
+		if(!file_exists(BAIKAL_PATH_SPECIFIC . "config.php")) {
+			throw new \Exception("Specific/config.php does not exist. Please use the Install tool to create it.");
+		}
+		
+		# Asserting config file is readable
+		if(!is_readable(BAIKAL_PATH_SPECIFIC . "config.php")) {
+			throw new \Exception("Specific/config.php is not readable. Please give read permissions to httpd user on file 'Specific/config.php'.");
+		}
+		
+		# Asserting config file is writable
+		if(!is_writable(BAIKAL_PATH_SPECIFIC . "config.php")) {
+			throw new \Exception("Specific/config.php is not writable. Please give write permissions to httpd user on file 'Specific/config.php'.");
+		}
+		
+		# Asserting system config file exists
+		if(!file_exists(BAIKAL_PATH_SPECIFIC . "config.system.php")) {
+			throw new \Exception("Specific/config.system.php does not exist. Please use the Install tool to create it.");
+		}
+		
+		# Asserting system config file is readable
+		if(!is_readable(BAIKAL_PATH_SPECIFIC . "config.system.php")) {
+			throw new \Exception("Specific/config.system.php is not readable. Please give read permissions to httpd user on file 'Specific/config.system.php'.");
+		}
+		
+		# Asserting system config file is writable
+		if(!is_writable(BAIKAL_PATH_SPECIFIC . "config.system.php")) {
+			throw new \Exception("Specific/config.system.php is not writable. Please give write permissions to httpd user on file 'Specific/config.system.php'.");
+		}
+	}
+	
 	public static function getUsers() {
 		
 		$aUsers = array();
diff --git a/CoreVersions/Baikal_0.1/Frameworks/Baikal/Model/Config/System.php b/CoreVersions/Baikal_0.1/Frameworks/Baikal/Model/Config/System.php
index 2d0c1e5..859bdba 100644
--- a/CoreVersions/Baikal_0.1/Frameworks/Baikal/Model/Config/System.php
+++ b/CoreVersions/Baikal_0.1/Frameworks/Baikal/Model/Config/System.php
@@ -36,10 +36,10 @@ class System extends \Baikal\Model\Config {
 			"type" => "string",
 		),
 		"BAIKAL_CARD_BASEURI" => array(
-			"type" => "string",
+			"type" => "litteral",
 		),
 		"BAIKAL_CAL_BASEURI" => array(
-			"type" => "string",
+			"type" => "litteral",
 		),
 		"BAIKAL_SQLITE_FILE" => array(
 			"type" => "litteral",
diff --git a/html/.htaccess b/html/.htaccess
new file mode 100644
index 0000000..284cb25
--- /dev/null
+++ b/html/.htaccess
@@ -0,0 +1,12 @@
+# Disabling URL rewrite and cache management
+# that could cause problems with DAV requests
+# Useful only for Apache servers, with AllowOverride All
+# (ie, .htaccess files enabled)
+
+<IfModule mod_rewrite.c>
+	RewriteEngine Off
+</IfModule>
+
+<IfModule mod_expires.c>
+	ExpiresActive Off
+</IfModule>
\ No newline at end of file