C / C++ / MFC

// ** just a dummy function to illustrate, this should 
// ** be called in response to a button -err, somethin
void COurProgram::OnCommandsHelp() {

	// ** set up a buffer to hold our current directory
	TCHAR szBuffer[MAX_PATH];
	// ** get the current directory
	GetCurrentDirectory(MAX_PATH, szBuffer);

	// ** set a string to the current directory plus
	// ** our help file 'help.html'
	CString strHelp;
	strHelp.Format("%s\\help.html", szBuffer);

	// ** set up the shell execute info
	SHELLEXECUTEINFO ShExecInfo = { 0 };
	ShExecInfo.cbSize = sizeof( SHELLEXECUTEINFO );
	ShExecInfo.fMask = SEE_MASK_NOCLOSEPROCESS;
	ShExecInfo.hwnd = NULL;
	ShExecInfo.lpVerb = "open";				// ** set to 'open' the file
	ShExecInfo.lpFile = strHelpFile;		// ** our file
	ShExecInfo.lpParameters = NULL;
	ShExecInfo.lpDirectory = NULL;
	ShExecInfo.nShow = SW_SHOWMAXIMIZED;	// ** set to show maximized
	ShExecInfo.hInstApp = NULL;

	// ** open the file maximized and keep a handle to it
	HINSTANCE h = ShellExecute(NULL, "open", strHelpFile, NULL, NULL, SW_SHOWMAXIMIZED);

	// ** check to see if the file was opened correctly
    if ((UINT)h > 32) {
	    // ** our process opend correctly, no worries
	    //.. other code you may want to process

    } else {
	    // ** the file wasn't opened so show an error message
	    // AfxMessageBox("Some Message");
	}

}
</code>

char szSomeString[] = "This is a string\0";
char szXORString[] = "String\0";
char szEncString[ 100 ];

for( i = 0; i < strlen( szSomeString ); i++ )
{
    szEncString[ i ] = szSomeString[ i ]; 
    for( j = 0; j < strlen( szXORString ); j++ )
         szEncString[ i ] ^= szXORString[ j ];
}
szEncString[ i ] = '\0';