FreeNX and restore of sessions

Hi I am running 2 hosts, workstation and server. On each of them I have suse 9.2 and I want to connect through FreeNX from client to workstation. On the workstation I start nxserver --start On client I use knx and I terminate this session with 'suspend'. How can I restore this session. If I use knx --session <sessionid> there will be created a new session. Where can I find the correct sessionid? Is there something that I do wrongly? -- Thanks for any help Sami