import sys
from PySide.QtCore import Slot
from PySide.QtGui import *


app = QApplication(sys.argv)
win = QWidget()
win.setWindowTitle('Test Window')

txt1 = QTextEdit()
txt2 = QTextEdit()
btn = QPushButton('OK')
brw = QTextBrowser()

grid = QGridLayout()
grid.addWidget(txt1, 0, 0)
grid.addWidget(txt2, 0, 1)
grid.addWidget(btn, 2, 0)
grid.addWidget(brw, 3, 0)
win.setLayout(grid)

@Slot()
def refresh():
    brw.setText(txt1.toPlainText() + " " + txt2.toPlainText())

btn.clicked.connect(refresh)

win.show()
app.exec_()