I don't think so. Not without prying open the laptop and creating some kind of clever hardware mod.
I suppose if your other PC's graphics card has S-VIDEO output, then in a complicated setup, you could purchase a USB video capture card with s-video input, hook it up to your laptop, boot the laptop, hook your PC to the video capture card using an S-VIDEO cable, thereby utilizing your laptop as a display for your PC.
But this is not practical because it would require you to power up both your laptop and PC, and graphics performance won't be as good.
My advise, just hook your PC up to an independant display.
|Desktop PC| |Macbook Air 13" (Mid 2013)|
|Windows 8.1 Pro (x64)| |AMD FX 4100 Black Edition 3.6 GHz @ 4.0 GHz OC| |Arctic Cooling Freezer 13 PRO| |Gigabyte Nvidia GeForce GTX 560 Super Overclock 1GB| |ASUS M5A78L-M/USB3 Motherboard| |Samsung 840 Pro 256GB SSD SATA III HDD| |Kingston HyperX 8GB PC3-14900 DDR3-1866| |OCZ ModXStream Pro 700W Modular PSU| |NZXT Vulcan Micro ATX Case|