From LogMeInWiki
string sSSOID = [your User ID];
string sSSOPassword = [Should be set manually];
System.Net.HttpWebRequest oReq =
(System.Net.HttpWebRequest)System.Net.WebRequest.Create("https://secure.logmeinrescue.com/SSO/GetLoginTicket.aspx?SSOID=" + sSSOID + "&Password=" + sSSOPassword + "&CompanyID=112938");
System.Net.HttpWebResponse oResp = (System.Net.HttpWebResponse)oReq.GetResponse();
string sResp = new System.IO.StreamReader(oResp.GetResponseStream()).ReadToEnd();
if (sResp.StartsWith("OK:"))
Response.Redirect( sResp.Substring("OK:".Length) );
else
Response.Write( sResp );