### SESSIONID -- unique ID for this session - Syntax: `%SESSIONID%` - Expand to: `544a3318f2c293cec889c7c1d62d6118` - Related: [[TWikiUserAuthentication]], [[AUTHREALM|Main/VarAUTHREALM]], [[SESSIONVAR|Main/VarSESSIONVAR]], [[LOGIN|Main/VarLOGIN]], [[LOGOUT|Main/VarLOGOUT]], [[SESSION_VARIABLE|Main/VarSESSION_VARIABLE]]