BASP21 Pro是一款基于Windows操作系統的全面的互聯網應用組件。BASP21 Pro是一個非常強大的組件，你可以把他用作服務器端的組件也可以作為客戶端的組件。

BASP21 Pro的重要特性如下：

  * can be run from All kind of Application.
    - you can use from ASP, VB/VBA/VC++
    - work as ActiveX Control in IE 3.02,4.0 5.0,5,5
  * Support SMTP (Send Mail Transfer Protocol) / POP3 (PostOffice Protocol)
    - Package mail transmission
    - Re-Sending Feature
    - Plug type mail transmission
  * File Upload (HTTP/FTP)
    - server-side
    - client-side, separating sending feature.
    - support SSL encrypted connection for Upload/Download.
  * File Download (HTTP/FTP)
    - client-side, with resume feature.
  * Environment Configuration Feature
   - you can configure server name, directory name ..etc using BASP21P.ini
  * Adding New Feature
    - Support File modification check ('SecureFile' Method)
    - Support Monitoring for BASP21 Pro Object Operation in different thread ('Monitor' Method)
    - Support Method canceling ('Cancel' Method)
    - Support Text file diff  ('Diff'  Method)
    - Support File Sort ('SortFile' Method)
  * Log Feature
    - Support collecting data for debugging and performance data
  * Adding Client-side Feature
    - Progress Condition Dialogue, User Interface with event support.
    - Auto Install by CAB file.
    - Auto Downloading by  BASP21P.INI
  * Adding Batch processing feature (BHELPER.EXE)
    - Run Method from command line.
    - Run Method from text file.

BASP21 Pro Component Requirements is as follows.