When multiserver administration is implemented, target servers periodically contact the master server to upload information on jobs that have been executed, and download new jobs. The process of contacting the master server is called server polling, which takes place at regular polling intervals. Polling Intervals. The polling interval (one minute by default) controls how frequently the target server connects to the master server to download instructions and upload the results of job execution.
In all cases of idiopathic or secondary adult TTP, plasma exchange is the basic treatment of choice. Plasma exchange involves the use of automated machinery which permits the removal of the patient's plasma and replacement with donor plasma during a 3 to 4 hour treatment.
The main treatment for primitive neuroectodermal tumours (PNETs) is surgery to remove the whole tumour or as much of it as possible. If the tumour has made fluid build up in the brain (hydrocephalus) you may need to take steroid tablets until you have an operation.hemotherapy for PNETs. Chemotherapy may be used alongside radiotherapy for older children with medulloblastoma and for adults where there is a high risk of the tumour spreading. Otherwise PNET specialists tend to keep chemotherapy to treat the tumour if it comes back after surgery and radiotherapy.