All available variables you can use in the TeXnicCenter configuration are listed in the TeXnicCenter online help, but you will not find one that will be replaced with the page number. This has a simple reason: TeXnicCenter does not know the layout of your document, because the layout is generated by LaTeX. So it is not possible for TeXnicCenter to determine on which page in the output a position in you TeX file is located. Sorry for that...
LaTeX Community Administrator
Originator of TeXnicCenter