9.3.2 Making Pageant run another program
You can arrange for Pageant to start another program once it has initialised itself and loaded any keys specified on its command line. This program (perhaps a PuTTY, or a WinCVS making use of Plink, or whatever) will then be able to use the keys Pageant has loaded.
You do this by specifying the -c option followed by the command, like this:
C:\PuTTY\pageant.exe d:\main.ppk -c C:\PuTTY\putty.exe