**CIGAL Reference Manual, Chapter 6 (RealTime): r_fork**
===== r_fork -- Start a new asynchronous command stream =====
**usage: r_fork  opflg eflag ltime [Flag]**

R_FORK is a REALTIME operator. It initiates an asynchronous command stream to
execute the block of commands between this R_FORK and the corresponding R_END.

The FLAG argument controls options. It is a bit-flag with the following meanings (combine options by addition):
   2 - this block of commands cannot be made synchronous by a R_SYNCH 
       command in the calling fork.
   4 - this block should use RT display screen 2 (see RT1RECT, SCR1RECT variables).

**See Also:**\\
[[jvs:cigal:manual:chapter4:SCR1rect|SCR1RECT],
[[jvs:cigal:manual:chapter4:rt1rect|RT1RECT]\\
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