PAExec lets you launch Windows programs on remote Windows computers without needing to install software on the remote computer first. For example, you could launch CMD.EXE remotely and have the equivalent of a terminal session to the remote server. PAExec is useful for doing remote installs, checking remote configuration, etc.
Anyone can download and use PAExec. You can include it in your open source, freeware and even commercial applications. You may distribute it on your website, on CDs, mail to friends, etc. There is no cryptography built in so there aren't any export restrictions that we know of. See the License for all the legalese.