PPP-API documentation ??

Hi,i use Digi connectme+JTAG with NetOS6.0. I want to create a simple router from serial to Ethernet with PPP. The serialport should be configured as direct or modem. I tried a few examples under /examples/ppp/… but none of them runs! I want to connect a windows PC (WinXP) with the “serial direct connection” to Ethernet. Has anybody a solution or a detail information about the PPP-API (for example: what ist the different between PASSIVE_CONNECTION_MODE and ACTIVE_CONNECTION_MODE). Thanks for all posts Sigi