Check your C-compiler. Many of them have a declaration syntax for bits. If they do then the statement is just something like
Code:
bit GIE INTCON.7
GIE = 0 ; /* Disable Interrupts */
...
GIE = 1 ; /* Enable Interrupts */
The declaration syntax is not part of the C language standard, but several compilers for processors that support bit addressing have invented such extensions. You do have to look carefully in the compiler documentation though.
Look for #pragma keyword=extended or something similar to see if there is a switch that enables or disables the extended language features.
If you think you've found something then write a short test program and look at the compiler output to see if it matches both your understanding and Nigel's example.
On real ports with a mixture of inputs and outputs you need to be careful with bsf and bcf instructions because in hardware they read all 8 bits of a port, modify the single bit, and write back all 8 bits. This can be problematic and there are warnings in the PIC data sheets.